Thursday, Oct 01, 2020 | Last Update : 03:31 AM IST

189th Day Of Lockdown

Maharashtra1351153104994735751 Andhra Pradesh6811616123005745 Tamil Nadu5863975307089383 Karnataka5824584697508641 Uttar Pradesh3908753312705652 Delhi2730982407035272 West Bengal2505802198444837 Odisha212609177585866 Telangana1872111564311107 Kerala179923121264698 Bihar178882164537888 Assam169985139977655 Gujarat1332191132403417 Rajasthan1288591077181441 Haryana1237821059901307 Madhya Pradesh117588932382207 Punjab107096840253134 Chhatisgarh9856566860777 Jharkhand7770964515661 Jammu and Kashmir69832495571105 Uttarakhand4533233642555 Goa3107125071386 Puducherry2548919781494 Tripura2412717464262 Himachal Pradesh136799526152 Chandigarh112128677145 Manipur9791760263 Arunachal Pradesh8649623014 Nagaland5768469311 Meghalaya5158334343 Sikkim2707199431 Mizoram178612880
  Science   11 Nov 2019  Researchers find reason behind slippery nature of ice!

Researchers find reason behind slippery nature of ice!

ANI
Published : Nov 11, 2019, 10:46 am IST
Updated : Nov 11, 2019, 10:46 am IST

Researcher's have for the first time been able to demonstrate why ice becomes slippery enough for people to skate on.

The mystery of sliding on ice can therefore be found in the
 The mystery of sliding on ice can therefore be found in the "viscous" nature of this film of water

Ever wondered why is ice so slippery or what is it that makes people skate on it? If yes, then here's the answer to it!

The answer lies in a film of water which is generated by friction, one that is far thinner than expected and much more viscous than usual water through its resemblance to the "snow cones" of crushed ice we drink during the summer.

 

The "slippery" nature of ice is generally attributed to the formation of a thin layer of liquid water generated by friction, which for instance allows an ice skater to "surf" on top of this liquid film.

This phenomenon was recently demonstrated by researchers from the CNRS and ENS-PSL, in a study published in Physical Review X.

Researchers developed a device equipped with a tuning fork -- similar to those used in music -- that can "hear" the forces at work during ice gliding with remarkable precision.

Despite the instrument's size, which measures a few centimetres, it is sensitive enough to probe ice and analyse the properties of friction on a nanometric scale.

 

Thanks to their unique device, researchers were able to clearly demonstrate for the first time that friction does indeed generate a film of liquid water.

This film nevertheless offered a number of surprises: with a thickness measuring a few hundred nanometres to a micron, or one hundredth the thickness of a strand of hair, it is much thinner than theoretical estimates had suggested.

Even more unexpectedly, this film is not at all "simple water," but consists of water that is as viscous as oil, with complex viscoelastic properties.

This unexpected behaviour suggests that surface ice does not completely transform into liquid water, but instead ends up in a mixed state similar to "snow cones", a mix of ice water and crushed ice. The mystery of sliding on ice can therefore be found in the "viscous" nature of this film of water

 

Tags: ice skating, viscosity of water, research, properties of water