Cream Soda Physics & Diving

[lamont]

w.r.t pressure and ice and such -- increasing pressure causes the freezing/melting point of h20 to drop. ice skaters utilize this by the increased pressure below their skates melting a tiny bit of the ice to produce water and decreasing the friction under their skates. h2o is unusual by behaving this way under pressure -- most substances have the opposite relationship between freezing/melting point and pressure.

 

[pete340]

So you get ice faster, but you get a lot less of it.

If I wanted a lot less ice I'd start with a lot less cold water, and then the cold water would freeze first. That's the logical flaw in the original comparison.

 

[jonnythan]

If I wanted a lot less ice I'd start with a lot less cold water, and then the cold water would freeze first. That's the logical flaw in the original comparison.

Yeah... that's the point........

 

[dlndavid]

Hot water freezing faster than cold. Why? Hot water in lets say an ice cube tray forms a better contact with the freezing element eliminating the insulation allow faster freezing.
http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/freezhot.html

 

[jonnythan]

Hot water freezing faster than cold. Why? Hot water in lets say an ice cube tray forms a better contact with the freezing element eliminating the insulation allow faster freezing.
http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/freezhot.html

....

 

[Sideband]

w.r.t pressure and ice and such -- increasing pressure causes the freezing/melting point of h20 to drop. ice skaters utilize this by the increased pressure below their skates melting a tiny bit of the ice to produce water and decreasing the friction under their skates. h2o is unusual by behaving this way under pressure -- most substances have the opposite relationship between freezing/melting point and pressure.

Thank you. I knew there was a real world example to show that but I couldn't think of it.

Joe