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Figure Skating · Interesting Facts

Chapter 5: Science & Equipment

10 parts · 10 tests · 100 facts · updated 20 October 2026 · markdown

The science and kit of skating: why ice is slippery, championship ice and how it is painted and mended, the Zamboni machine and its inventor, the physics of a quad, jump heights measured at Nagano, Guinness records, and how a skate boot is made.

5.51Why Ice Is Slippery

From pressure melting to rolling molecules: what a 2018 study found about the slipperiness of ice.

Test 1The slipperiness of iceTake a test

  1. The Irish physicist argued that the local contact pressure is so high that the ice melts.

    Source: University of Amsterdam, The slipperiness of ice explained (8 May 2018), on Weber et al., Journal of Physical Chemistry Letters · recall

  2. The 2018 release notes that liquid water helps, but frictional heat melts it, not pressure.

    Source: University of Amsterdam, The slipperiness of ice explained (8 May 2018), on Weber et al., Journal of Physical Chemistry Letters · recall

  3. These molecules roll over the ice like tiny spheres, driven by thermal vibrations.

    Source: University of Amsterdam, The slipperiness of ice explained (8 May 2018), on Weber et al., Journal of Physical Chemistry Letters · recall

  4. As the temperature rises, more of the fixed molecules turn mobile, and friction falls with it.

    Source: University of Amsterdam, The slipperiness of ice explained (8 May 2018), on Weber et al., Journal of Physical Chemistry Letters · recall

  5. It is the same temperature that speed skating rinks use.

    Source: University of Amsterdam, The slipperiness of ice explained (8 May 2018), on Weber et al., Journal of Physical Chemistry Letters · recall

  6. Close to melting, a sliding object sinks deeper into the softer surface.

    Source: University of Amsterdam, The slipperiness of ice explained (8 May 2018), on Weber et al., Journal of Physical Chemistry Letters · recall

  7. At -100 °C ice turned out to be a high-friction surface, far from slippery.

    Source: University of Amsterdam, The slipperiness of ice explained (8 May 2018), on Weber et al., Journal of Physical Chemistry Letters · recall

  8. Experiments, then spectroscopy, then simulations, which together pointed to mobile surface molecules.

    Source: University of Amsterdam, The slipperiness of ice explained (8 May 2018), on Weber et al., Journal of Physical Chemistry Letters · recall

  9. Lowest friction at -7 °C, harder sliding on soft ice near 0 °C and high friction at -100 °C.

    Source: University of Amsterdam, The slipperiness of ice explained (8 May 2018), on Weber et al., Journal of Physical Chemistry Letters · recall

  10. C sits at -7 °C; A is -100 °C, B -50 °C and D 0 °C.

    Source: University of Amsterdam, The slipperiness of ice explained (8 May 2018), on Weber et al., Journal of Physical Chemistry Letters · applied

5.52Ice for a World Championships

How Boston's TD Garden turned hockey ice into figure skating ice for the 2025 Worlds.

Test 1Championship iceTake a test

  1. That is an inch or more above the hockey standard.

    Source: The Boston Globe, How TD Garden prepared for the World Figure Skating Championships (26 March 2025) · recall

  2. Without depth, he said, a skater would just be hitting the concrete beneath.

    Source: The Boston Globe, How TD Garden prepared for the World Figure Skating Championships (26 March 2025) · recall

  3. Slightly softer ice helps skaters on their landings.

    Source: The Boston Globe, How TD Garden prepared for the World Figure Skating Championships (26 March 2025) · recall

  4. Figure skaters jump, land and spin; they are not just doing stops, the director said.

    Source: The Boston Globe, How TD Garden prepared for the World Figure Skating Championships (26 March 2025) · recall

  5. So the whole building ran slightly warmer than on a hockey night.

    Source: The Boston Globe, How TD Garden prepared for the World Figure Skating Championships (26 March 2025) · recall

  6. That eased the strain on the ice plant as well.

    Source: The Boston Globe, How TD Garden prepared for the World Figure Skating Championships (26 March 2025) · recall

  7. The bull gang started that Friday night, at the final horn.

    Source: The Boston Globe, How TD Garden prepared for the World Figure Skating Championships (26 March 2025) · recall

  8. The crew worked from the final horn onwards so the ice was ready for the skaters.

    Source: The Boston Globe, How TD Garden prepared for the World Figure Skating Championships (26 March 2025) · recall

  9. Hockey ice ran about 5 degrees colder than the 22 °F of the Worlds; water freezes at 32 °F.

    Source: The Boston Globe, How TD Garden prepared for the World Figure Skating Championships (26 March 2025) · recall

  10. C is about 2½ inches; A is 1 inch, B 1½ inches and D 4 inches.

    Source: The Boston Globe, How TD Garden prepared for the World Figure Skating Championships (26 March 2025) · applied

5.53Painting and Mending the Ice

The gray ice of the 2025 Worlds, the logos and the pluggers who fix the divots.

Test 1Painting and mendingTake a test

  1. White paint masked everything so nothing would bleed through the new surface.

    Source: The Boston Globe, How TD Garden prepared for the World Figure Skating Championships (26 March 2025) · recall

  2. The Canadian firm's paint covered the lines before the new colour went on.

    Source: The Boston Globe, How TD Garden prepared for the World Figure Skating Championships (26 March 2025) · recall

  3. The ISU logos and the centre logo were laid on top of it.

    Source: The Boston Globe, How TD Garden prepared for the World Figure Skating Championships (26 March 2025) · recall

  4. The cameras sat about 10 feet above the ice.

    Source: The Boston Globe, How TD Garden prepared for the World Figure Skating Championships (26 March 2025) · recall

  5. Gray reduced the glare those cameras would pick up from a white surface.

    Source: The Boston Globe, How TD Garden prepared for the World Figure Skating Championships (26 March 2025) · recall

  6. They wore hockey skates and worked just before the resurfacers made new ice.

    Source: The Boston Globe, How TD Garden prepared for the World Figure Skating Championships (26 March 2025) · recall

  7. The thicker, warmer ice still carried some risk of chips and ruts.

    Source: The Boston Globe, How TD Garden prepared for the World Figure Skating Championships (26 March 2025) · recall

  8. The logos went onto the gray before the final flood.

    Source: The Boston Globe, How TD Garden prepared for the World Figure Skating Championships (26 March 2025) · recall

  9. Pluggers work just ahead of the resurfacers.

    Source: The Boston Globe, How TD Garden prepared for the World Figure Skating Championships (26 March 2025) · recall

  10. A is the hockey ice, B the white masking paint, C the gray and D the fresh frozen inch of water.

    Source: The Boston Globe, How TD Garden prepared for the World Figure Skating Championships (26 March 2025) · applied

5.54The Zamboni Machine

How Frank Zamboni's resurfacer works, and who bought the first machines.

Test 1The ice resurfacerTake a test

  1. Too much skating time was lost each day, he thought.

    Source: J. Scafetta Jr., Frank J. Zamboni, Jr.: The Man Behind the Machine (Fra Noi, 2001; reprinted on zamboni.com) · recall

  2. A blade shaves the ice and the machine collects, washes and floods in one pass.

    Source: J. Scafetta Jr., Frank J. Zamboni, Jr.: The Man Behind the Machine (Fra Noi, 2001; reprinted on zamboni.com) · recall

  3. His first machine did not work well, and he put the designs aside until 1947.

    Source: J. Scafetta Jr., Frank J. Zamboni, Jr.: The Man Behind the Machine (Fra Noi, 2001; reprinted on zamboni.com) · recall

  4. The family partnership began production with an improved Model B.

    Source: J. Scafetta Jr., Frank J. Zamboni, Jr.: The Man Behind the Machine (Fra Noi, 2001; reprinted on zamboni.com) · recall

  5. Frank drove the parts to Chicago himself so the machine could be assembled for her show.

    Source: J. Scafetta Jr., Frank J. Zamboni, Jr.: The Man Behind the Machine (Fra Noi, 2001; reprinted on zamboni.com) · recall

  6. It is kept in Eveleth, Minnesota.

    Source: J. Scafetta Jr., Frank J. Zamboni, Jr.: The Man Behind the Machine (Fra Noi, 2001; reprinted on zamboni.com) · recall

  7. It appears before each period of a hockey game, the history notes.

    Source: J. Scafetta Jr., Frank J. Zamboni, Jr.: The Man Behind the Machine (Fra Noi, 2001; reprinted on zamboni.com) · recall

  8. The used water is filtered and returned to its tank.

    Source: J. Scafetta Jr., Frank J. Zamboni, Jr.: The Man Behind the Machine (Fra Noi, 2001; reprinted on zamboni.com) · recall

  9. 1950, then Henie's two machines, the Ice Capades in 1952 and ten units in 1954.

    Source: J. Scafetta Jr., Frank J. Zamboni, Jr.: The Man Behind the Machine (Fra Noi, 2001; reprinted on zamboni.com) · recall

  10. B is ten minutes; A is the 90 minutes three men needed by hand, C and D other times for comparison.

    Source: J. Scafetta Jr., Frank J. Zamboni, Jr.: The Man Behind the Machine (Fra Noi, 2001; reprinted on zamboni.com) · applied

5.55Frank Zamboni and Iceland

The inventor behind the machine: block ice, the Iceland rink, a new city and fifteen patents.

Test 1The inventorTake a test

  1. He was born in Eureka and grew up on a farm in Idaho.

    Source: J. Scafetta Jr., Frank J. Zamboni, Jr.: The Man Behind the Machine (Fra Noi, 2001; reprinted on zamboni.com) · recall

  2. They supplied fruit and vegetable packers shipping produce in rail cars.

    Source: J. Scafetta Jr., Frank J. Zamboni, Jr.: The Man Behind the Machine (Fra Noi, 2001; reprinted on zamboni.com) · recall

  3. In 1939 they sold the business but kept the equipment to build a rink.

    Source: J. Scafetta Jr., Frank J. Zamboni, Jr.: The Man Behind the Machine (Fra Noi, 2001; reprinted on zamboni.com) · recall

  4. The 100 by 200 foot open-air rink could hold 800 skaters.

    Source: J. Scafetta Jr., Frank J. Zamboni, Jr.: The Man Behind the Machine (Fra Noi, 2001; reprinted on zamboni.com) · recall

  5. About 150,000 skaters used the rink each year.

    Source: J. Scafetta Jr., Frank J. Zamboni, Jr.: The Man Behind the Machine (Fra Noi, 2001; reprinted on zamboni.com) · recall

  6. It joined the towns of Hynes and Clearwater; the company is still based there.

    Source: J. Scafetta Jr., Frank J. Zamboni, Jr.: The Man Behind the Machine (Fra Noi, 2001; reprinted on zamboni.com) · recall

  7. It pumped about 400 gallons a minute and saved several World Series games from rain-outs.

    Source: J. Scafetta Jr., Frank J. Zamboni, Jr.: The Man Behind the Machine (Fra Noi, 2001; reprinted on zamboni.com) · recall

  8. 1940, 1948, 1949 and 1983.

    Source: J. Scafetta Jr., Frank J. Zamboni, Jr.: The Man Behind the Machine (Fra Noi, 2001; reprinted on zamboni.com) · recall

  9. 1965, 1988 and 2000, the last after his death.

    Source: J. Scafetta Jr., Frank J. Zamboni, Jr.: The Man Behind the Machine (Fra Noi, 2001; reprinted on zamboni.com) · recall

  10. A is 1927, the ice plant, B 1940, C 1949, the patent application, and D 1983, his last patent.

    Source: J. Scafetta Jr., Frank J. Zamboni, Jr.: The Man Behind the Machine (Fra Noi, 2001; reprinted on zamboni.com) · applied

5.56The Physics of a Quad

Airtime, force and angular momentum: what physicists say about the quadruple jump.

Test 1Physics of the quadTake a test

  1. All four turns have to fit inside that window.

    Source: George Mason University, On the Blade's Edge of Physics: How Ilia Malinin Lands the Quad Lutz (13 February 2026) · recall

  2. A person can jump about two feet straight up; athletes roughly double that.

    Source: George Mason University, On the Blade's Edge of Physics: How Ilia Malinin Lands the Quad Lutz (13 February 2026); Northeastern University College of Science, Figure skating in the 2022 Olympics hinged on quad jumps (24 February 2022) · recall

  3. Almost all of the rotation must be generated before the skater leaves the ice.

    Source: George Mason University, On the Blade's Edge of Physics: How Ilia Malinin Lands the Quad Lutz (13 February 2026) · recall

  4. That is close to the fastest spin on record, 342 a minute.

    Source: George Mason University, On the Blade's Edge of Physics: How Ilia Malinin Lands the Quad Lutz (13 February 2026); Guinness World Records, Fastest spin on ice skates · recall

  5. Pulling the arms in doesn't make you spin, the physicist says; it only makes you spin faster.

    Source: George Mason University, On the Blade's Edge of Physics: How Ilia Malinin Lands the Quad Lutz (13 February 2026) · recall

  6. A compact body turns faster for the same angular momentum.

    Source: George Mason University, On the Blade's Edge of Physics: How Ilia Malinin Lands the Quad Lutz (13 February 2026); Northeastern University College of Science, Figure skating in the 2022 Olympics hinged on quad jumps (24 February 2022) · recall

  7. Opening up raises the moment of inertia, which slows the turn.

    Source: George Mason University, On the Blade's Edge of Physics: How Ilia Malinin Lands the Quad Lutz (13 February 2026) · recall

  8. The landing, she says, is a second physics problem as hard as the take-off.

    Source: George Mason University, On the Blade's Edge of Physics: How Ilia Malinin Lands the Quad Lutz (13 February 2026) · recall

  9. Out, in and out again: the moment of inertia falls, then rises to slow the turn.

    Source: Northeastern University College of Science, Figure skating in the 2022 Olympics hinged on quad jumps (24 February 2022); George Mason University, On the Blade's Edge of Physics: How Ilia Malinin Lands the Quad Lutz (13 February 2026) · recall

  10. C is more than 550 pounds; B is the triple's roughly 440; A and D are other values for comparison.

    Source: George Mason University, On the Blade's Edge of Physics: How Ilia Malinin Lands the Quad Lutz (13 February 2026) · applied

5.57Jump Heights at Nagano 1998

An IOC biomechanics project measured every jump in the women's free skating at the 1998 Olympics.

Test 1Measuring jumpsTake a test

  1. Researchers from Nagoya and Tsukuba universities analysed the jumps.

    Source: Sakurai, Ikegami, Akiya, Asano: Jump Height in Ladies Single Figure Skating at Nagano 1998 (ISBS 1999) · recall

  2. A camera recorded 60 fields a second, and height followed from the time in the air.

    Source: Sakurai, Ikegami, Akiya, Asano: Jump Height in Ladies Single Figure Skating at Nagano 1998 (ISBS 1999) · recall

  3. The toe tap lets a skater turn approach speed into height, the authors suggest.

    Source: Sakurai, Ikegami, Akiya, Asano: Jump Height in Ladies Single Figure Skating at Nagano 1998 (ISBS 1999) · recall

  4. It averaged 0.518 m; the Lutz is the only jump that turns against its take-off edge.

    Source: Sakurai, Ikegami, Akiya, Asano: Jump Height in Ladies Single Figure Skating at Nagano 1998 (ISBS 1999) · recall

  5. One was by Tatiana Malinina, who placed eighth.

    Source: Sakurai, Ikegami, Akiya, Asano: Jump Height in Ladies Single Figure Skating at Nagano 1998 (ISBS 1999) · recall

  6. Fewer rotations, fewer toe jumps and fatigue were the possible reasons given.

    Source: Sakurai, Ikegami, Akiya, Asano: Jump Height in Ladies Single Figure Skating at Nagano 1998 (ISBS 1999) · recall

  7. The best placed showed the best endurance in keeping their jumps high.

    Source: Sakurai, Ikegami, Akiya, Asano: Jump Height in Ladies Single Figure Skating at Nagano 1998 (ISBS 1999) · recall

  8. 0.488 m, 0.451 m, 0.416 m and 0.357 m across all rotations.

    Source: Sakurai, Ikegami, Akiya, Asano: Jump Height in Ladies Single Figure Skating at Nagano 1998 (ISBS 1999) · recall

  9. Height came from the formula H = gT²/8, with T the time in the air.

    Source: Sakurai, Ikegami, Akiya, Asano: Jump Height in Ladies Single Figure Skating at Nagano 1998 (ISBS 1999) · recall

  10. A is the Axel (0.398), B the Lutz (0.488), C the Salchow (0.357) and D the toe loop (0.416).

    Source: Sakurai, Ikegami, Akiya, Asano: Jump Height in Ladies Single Figure Skating at Nagano 1998 (ISBS 1999) · applied

5.58Skating in Guinness World Records

The fastest spin, the most spins on one foot, spins with a partner on the head and record scores.

Test 1Records in GuinnessTake a test

  1. The Canadian set it on 19 January 2015.

    Source: Guinness World Records, Fastest spin on ice skates · recall

  2. Warsaw is her birth city.

    Source: Guinness World Records, Fastest spin on ice skates · recall

  3. Children with life-threatening illnesses in Poland and the youth charity Leave Out Violence.

    Source: Guinness World Records, Fastest spin on ice skates · recall

  4. The Swiss skater set it at Chelsea Piers Sky Rink in New York.

    Source: Guinness World Records, Most continuous upright spins on ice skates · recall

  5. The judge was named on the record's page.

    Source: Guinness World Records, Most continuous upright spins on ice skates · recall

  6. The married professional skaters set the record on 24 June 2024.

    Source: Guinness World Records, Most consecutive spins balancing a person on the head while ice skating · recall

  7. His total was 280.98; the certificates were presented in Toronto at a Skate Canada reception.

    Source: Guinness World Records News, Patrick Chan honoured for triple world record achievement (14 September 2011) · recall

  8. 2003, 2011, 2015 and 2024.

    Source: Guinness World Records (record pages for Ruh, Oliver and the Rappolds; news on Patrick Chan, 2011) · recall

  9. 93.02, 187.96 and 280.98.

    Source: Guinness World Records News, Patrick Chan honoured for triple world record achievement (14 September 2011) · recall

  10. C is 115 spins; A is the Rappolds' 51, B Chan's 93.02 short program and D Oliver's 342 a minute.

    Source: Guinness World Records (record pages for Ruh, Oliver and the Rappolds; news on Patrick Chan, 2011) · applied

5.59Riedell's Story

A boot maker from Red Wing, Minnesota, run by the same family for three generations.

Test 1The Riedell companyTake a test

  1. They set out to make high-quality, hand-crafted skating boots.

    Source: Riedell Ice Skates, Our Story (ice.riedellskates.com/about); Riedell Roller Skates, About Us · recall

  2. The company still has its address on Cannon River Avenue there.

    Source: Riedell Ice Skates, Our Story (ice.riedellskates.com/about); Riedell Roller Skates, About Us · recall

  3. He combined what he learned with his own skating knowledge.

    Source: Riedell blog, A Riedell History Lesson (9 August 2012) · recall

  4. He was honoured on both sides of the sport.

    Source: Riedell Ice Skates, Our Story (ice.riedellskates.com/about); Riedell Roller Skates, About Us; Riedell blog, A Riedell History Lesson (9 August 2012) · recall

  5. Roller rinks were springing up across the country at the time.

    Source: Riedell Ice Skates, Our Story (ice.riedellskates.com/about); Riedell Roller Skates, About Us · recall

  6. Scott, Bob, Paul and Dan Riegelman carry on the business.

    Source: Riedell Ice Skates, Our Story (ice.riedellskates.com/about); Riedell Roller Skates, About Us; Riedell blog, A Riedell History Lesson (9 August 2012) · recall

  7. The company calls its range the most complete line of ice skates in the world.

    Source: Riedell blog, A Riedell History Lesson (9 August 2012) · recall

  8. From the 1940s, through the late 1960s, to the third generation today.

    Source: Riedell Ice Skates, Our Story (ice.riedellskates.com/about); Riedell Roller Skates, About Us · recall

  9. Medical books borrowed from a friend were his starting point.

    Source: Riedell blog, A Riedell History Lesson (9 August 2012) · recall

  10. B is a roller skate; A is a figure skate, C a bone runner and D a wooden skate with an iron.

    Source: Riedell Ice Skates, Our Story (ice.riedellskates.com/about); Riedell Roller Skates, About Us · applied

5.60How a Skate Is Made

Cutting, fitting, lasting and finishing: the steps of a figure skate boot at Riedell.

Test 1Making a bootTake a test

  1. The company sums them up in five main stages.

    Source: Riedell blog, Behind the Scenes at Riedell: How Figure Skates Are Made (8 September 2024) · recall

  2. The upper is shaped over it in the lasting stage.

    Source: Riedell blog, Behind the Scenes at Riedell: How Figure Skates Are Made (8 September 2024) · recall

  3. Fitting follows the cutting of leather and other materials.

    Source: Riedell blog, Behind the Scenes at Riedell: How Figure Skates Are Made (8 September 2024) · recall

  4. The article lists it among the extra steps, with punching eyelets and roughing the bottom.

    Source: Riedell blog, Behind the Scenes at Riedell: How Figure Skates Are Made (8 September 2024) · recall

  5. A leather sole is then attached and the blade screwed in place.

    Source: Riedell blog, Behind the Scenes at Riedell: How Figure Skates Are Made (8 September 2024) · recall

  6. Boots can also be synthetic, hard plastic or a mix of leather and synthetics.

    Source: Riedell blog, Behind the Scenes at Riedell: How Figure Skates Are Made (8 September 2024) · recall

  7. Other blades are carbon steel, coated high-speed steel or powder metal tool steel.

    Source: Riedell blog, Behind the Scenes at Riedell: How Figure Skates Are Made (8 September 2024) · recall

  8. From the cut materials to a boxed, inspected boot.

    Source: Riedell blog, Behind the Scenes at Riedell: How Figure Skates Are Made (8 September 2024) · recall

  9. The blade is the last part fitted, under the sole.

    Source: Riedell blog, Behind the Scenes at Riedell: How Figure Skates Are Made (8 September 2024) · recall

  10. A marks the upper, B the heel, C the shank inside the sole and D the blade.

    Source: Riedell blog, Behind the Scenes at Riedell: How Figure Skates Are Made (8 September 2024) · applied

Sources

University of Amsterdam release on Weber et al. (2018); The Boston Globe on TD Garden (2025); the Zamboni history reprinted on zamboni.com; George Mason and Northeastern universities; Sakurai et al., ISBS 1999; Guinness World Records; Riedell's own pages. Riedell's care and fitting advice is KT material and is not asked again. Every fact is recorded with its source in docs/FIGURE_SKATING_VERIFIED_FACTS.md.

  • The Boston Globe, How TD Garden prepared for the World Figure Skating Championships (26 March 2025)20
  • J. Scafetta Jr., Frank J. Zamboni, Jr.: The Man Behind the Machine (Fra Noi, 2001; reprinted on zamboni.com)20
  • University of Amsterdam, The slipperiness of ice explained (8 May 2018), on Weber et al., Journal of Physical Chemistry Letters10
  • Sakurai, Ikegami, Akiya, Asano: Jump Height in Ladies Single Figure Skating at Nagano 1998 (ISBS 1999)10
  • Riedell blog, Behind the Scenes at Riedell: How Figure Skates Are Made (8 September 2024)10
  • George Mason University, On the Blade's Edge of Physics: How Ilia Malinin Lands the Quad Lutz (13 February 2026)6
  • Riedell Ice Skates, Our Story (ice.riedellskates.com/about); Riedell Roller Skates, About Us5
  • Guinness World Records, Fastest spin on ice skates3
  • Riedell blog, A Riedell History Lesson (9 August 2012)3
  • George Mason University, On the Blade's Edge of Physics: How Ilia Malinin Lands the Quad Lutz (13 February 2026); Northeastern University College of Science, Figure skating in the 2022 Olympics hinged on quad jumps (24 February 2022)2
  • Guinness World Records, Most continuous upright spins on ice skates2
  • Guinness World Records News, Patrick Chan honoured for triple world record achievement (14 September 2011)2
  • Guinness World Records (record pages for Ruh, Oliver and the Rappolds; news on Patrick Chan, 2011)2
  • Riedell Ice Skates, Our Story (ice.riedellskates.com/about); Riedell Roller Skates, About Us; Riedell blog, A Riedell History Lesson (9 August 2012)2
  • George Mason University, On the Blade's Edge of Physics: How Ilia Malinin Lands the Quad Lutz (13 February 2026); Guinness World Records, Fastest spin on ice skates1
  • Northeastern University College of Science, Figure skating in the 2022 Olympics hinged on quad jumps (24 February 2022); George Mason University, On the Blade's Edge of Physics: How Ilia Malinin Lands the Quad Lutz (13 February 2026)1
  • Guinness World Records, Most consecutive spins balancing a person on the head while ice skating1