How Do We Skate On Ice? | Earth Science

[@cicalinarrot]

Why on earth did you decide not to show the wire getting out on the other side??? This makes the video one of the most unsatisfactory experiences in my life.

[@edweiser63]

Except the localized pressure theory has been debunked long ago.

[@AliHSyed]

I thought so too.

[@wint3rsmith42]

well dont just say that, tell us how, we need to know where you found this out

[@marionagamura]

Yeah, you are right. Nobody knows the answer for sure, but scientists are still looking for. A recent article: www.livescience.com/62621-why-is-ice-slippery.html

[@gnomee9447]

As far as I know, the top layer of ice is a quasi-liquid. Compare it to a layer of marbles on the floor.

[@kaziupir]

Ice is just slippery, there is no science, same as Diddy's women ass lubed with baby oil.

[@Bc232klm]

It's not just the pressure though, as that would account for only a few degree change at best, and you can still skate on supercold ice. It's also slippery in shoes and not just skates. There's more at play here than that one aspect.

[@Jonny-hm3iz]

2:20 "one of the key reasons"

[@ptrinch]

The temperature does not change. It's all a function of the pressure. Basically, there are two factors in determining the state of a chemical, the temperature and the pressure. Most chemicals will go from liquid to solid if you either decrease the temperature or you increase the pressure. Water, on the other hand, is quite unique in that the it goes from liquid to solid if you decrease the pressure (and solid to liquid when you increase the pressure). At -5 degrees Celsius, water is solid at 15 psi of pressure. But if you increase the pressure to 60PSI, it will turn to liquid and still be at -5 degrees. Effectively, the skates (or shoes) increase the pressure enough to melt just enough of the ice to allow you to slide. Once you slide off, it quickly refreezes.

[@RedWingsninetyone]

Having worked at an ice rink, I can tell you it isn't as slippery as you think in regular shoes. Wet ice (as often found in nature) is what accounts for falls. Its smoothness combined with the pressure is what makes it more slick than the normal ground you walk on.

[@Skerrry]

​@@Jonny-hm3izIt is not a key reason though. A human is way too light to reduce the melting point of ice in any meaningful amount.

[@edmossbb]

This experiment is indeed interesting but it has little connection with our ability to skating on ice. It would have been far more interesting if we could see the end result after the wire had fully passed through the ice block and seen whether it remained "intact" or became fragile and completely bisected.

[@kelamsaikumar6258]

it will remain contact....As the upper part of the ice was connecting so it was already in contact

[@marco3078]

That millisecond the blade passes it melts the ice and freezes as soon as it past. This is like saying you’re drinking water while you’re breathing since there is h2o in the air. Stop it. It doesn’t melt and instantly freeze.

[@jonotaylor5011]

what happens if you repeat the experiment with a nylon thread of equal diameter? (i.e. less conductive material)

[@serock3]

Why do you imagine that that would make a difference?

[@leecoldsmoke]

@@serock3 To show that it is indeed the pressure and not the temperature of the wire that is doing the melting since a big part of the wire and the metal weight is at room temperature.

[@serock3]

@@leecoldsmoke Oh, right, heat conductivity, that makes sense. I imagine that it would work regardless since the freezing point of water does lower with pressure, though my thermal physics textbook says that whether or not this contributes to ice slipperiness is not agreed upon by scientists.

[@sigridvanosch1990]

Does it matter where the ice is? warm or cold place? In the video it looks like an office, which would be around 20 degrees celsius.... How does this affect the ice with the wire?

[@celtgunn9775]

Two Debby Downers just had to thumb this down? Seriously? 🤔 Whatever for?¡ That's childish. This was fascinating to watch & learn about. Thank you. I do only wish it were longer. 😉

[@harryh536]

Well said. I still don't know how to skate.

[@Logicalx]

Guildford Spectrum

[@c.ladimore1237]

0:17 vulcan gary numan

[@spitfireflyer7544]

I still think it's witchcraft...

[@dkpirie]

God damn.