i need a physics explanations, ty.
2006-08-27 19:20:45 · 8 answers · asked by bqoo 1 in Science & Mathematics ➔ Physics
when you increase the pressure you are forcing the molecules closer together. in order for them to move apart you need more energy or an increased temperature. basically any system in equilibrium, that has an external force applied to it will react in a way to conteract that force. if a solid is at the melting point but not melting is put under pressure the intermolecular forces are no longer about to break for the system to get back to the situation it was in an increased temp would be required. when you increase temp, you stretch intermol bonds which are breaking and forming at a constant rate in a liquid. in a solid they stay formed, in a gas they are nonexistant(ideally)
2006-08-27 19:34:41 · answer #1 · answered by Anonymous · 0⤊ 0⤋
The melting point increases, due to the temperature drop at high pressure / altitude.
The formula P1*V1/T1 = P2*V2/ T2
The affects of pressure on an object with the same volume at 2 different location can prove the formula.
2006-08-27 20:32:36 · answer #2 · answered by isz_rossi 3 · 0⤊ 0⤋
It need not do so. In most substances, melting is accompanied by an increase in volume, and high pressure resists the expansion, so the melting point must rise. In water, however, melting causes a decrease in volume, so high pressure would be expected to cause the melting point to fall. (I have not checked to see whether this is the case.)
2006-08-27 19:26:31 · answer #3 · answered by Anonymous · 1⤊ 0⤋
Because PV = nRT. ie pressure and temperature have a linear relationship. If one goes up so must the other. I wont worry about the explanations of why, you can figure that out. Good luck.
2006-08-27 19:32:07 · answer #4 · answered by twerf 2 · 1⤊ 0⤋
At high pressures the molecules become excited and the melting points will be lower just like the boiling points...But if you are doing advance physics...don't forget about your threshold energy if your doing energy transformations and good luck! Welcome to the wonderful world of physics!
2006-08-27 19:24:30 · answer #5 · answered by partout250 4 · 1⤊ 2⤋
due to high pressure atoms tend to fix in thier position.
2006-08-27 21:06:07 · answer #6 · answered by eshaghi_2006 3 · 0⤊ 0⤋
because the pressure is directily prop. to the temp. so when the pressure inc the temp inc.
2006-08-27 20:06:56 · answer #7 · answered by SKY I 2 · 0⤊ 0⤋
when the pressure increase the moleules come more closer and they are not free ..............so they need more energy(heat) .......therefore melting point increases
2006-08-27 19:24:27 · answer #8 · answered by pappu 2 · 0⤊ 1⤋