If the melting point of a solid, and freezing point of a liquid are the same temperature..?

Question

Does this also mean when a metal is heated and becomes a liquid, then cools down to be a solid, this is classsed as its freezing point also.I associate freezing with being cold.

Answer 1

Most materials can exist as a solid ,liquid or gas.Therefore they have a temperature at which they turn from a solid to a liquid (melting) and a temperature at which they turn to a gas (boiling). The freezing point is the same temp as the melting point, it just depends on which direction you are going and whether you are adding or taking away heat. The condensation point is the same as the boiling point.There is a significant amount of heat that has to be added to change phase, at that temp. Some materials sublime, turn directly from a solid to a gas. If you consider oxygen, a gas, the condensation point is way below zero and the freezing point below that. With a metal, the melting and boiling points are high.

Answer 2

Yes, but it is generally called the melting point in science even if the substance is a liquid at room temperature so the melting point of water is 0 C.

(Somone earlier talked about sublimation point, just to warn you that is a totally different process. Sublimation refers to when a gas that goes directly to a solid without becoming a liquid and vice versa. Carbon dioxide is one compound which sublimes)

Answer 3

Freezing is just the process of a liquid becoming a solid and can occur at any temperature.

Other phase change terms:
melt - solid to liquid
evaporate - liquid to gas
condense - gas to liquid
sublimation - solid to gas
deposition - gas to solid

Answer 4

Well, take carbon dioxide as an example. At normal atmospheric pressure, it goes straight from a solid to a gas, causing that spooky dry ice effect. However, at higher pressures carbon dioxide can exist as a liquid, and there is one pressure where, if the temperature is exactly right, that carbon dioxide exists as a solid, liquid, and gas simultaneously.

The same is true of water. At normal atmospheric pressure, water can exist as a liquid, but at a sufficiently low pressure, water goes straight from solid to gas.

Answer 5

The transition of ice directly to vapour occurs at about 4mm Hg.
There is a technique where the pressure on frozen vegetables - for example - is reduced to below that 4mm. The process - surprise, surprise - is known as freeze drying.
Lots of other applications too - look it up.
RoyS

Answer 6

You are correct. Freezing and melting only describes a transition of state, it has nothing to do with the temperature at which that transition occurs.

Answer 7

At the nearest bookstore there is your answer. Ask in a chemical department physical chemistry handbook. Look there. Good luck!

Answer 8

The term is not "freezing" point. "Sublimination" point would be closer to the mark. The reason some people say freezing point is because they associate sublimination with water and ice. There is only one freezing point: 0 C 32 F.

Answer 9

Yes, that's correct.

Answer 10

eh