Thread: Regelation

Hello physics forum members, i once again have an inquiry to ask you on this process called regelation.

it is said that when pressure increases, then the melting point of water decreases. i guess by this it means as pressure is increased then the temperature the ice melt will decrease, So less energy is required for ice to melt.colder than zero temperatures i assume. so conclusion here would be that it is easier to get the ice melting if pressure is increased? am i right? if not do not hesitate to correct me,(appreciate the absence of criticism). and if so, why is this phenomenon true? what particle theory is there to explain the increase in pressure in relation to melting point??

Also another theory in my book says that when impurities are added to pure water, it again melts at a temperature lower than 0 degrees celsius. Again Why is this true??

Thank you in advance.

Originally Posted by Heinsbergrelatz

Hello physics forum members, i once again have an inquiry to ask you on this process called regelation.

it is said that when pressure increases, then the melting point of water decreases. i guess by this it means as pressure is increased then the temperature the ice melt will decrease, So less energy is required for ice to melt.colder than zero temperatures i assume. so conclusion here would be that it is easier to get the ice melting if pressure is increased? am i right? if not do not hesitate to correct me,(appreciate the absence of criticism). and if so, why is this phenomenon true? what particle theory is there to explain the increase in pressure in relation to melting point??

Also another theory in my book says that when impurities are added to pure water, it again melts at a temperature lower than 0 degrees celsius. Again Why is this true??

Thank you in advance.

It is related to the unusual property of water that it expands when it freezes.

It is one of the reasons why ice at or nearl 0C is so slippery. When something bears on the ice it melts, and you have a layer of liquid atop the solid ice -- very slippery.