it is called 'freezing' see http://en.wikipedia.org/wiki/Phase_transition
What's the temperature at which this happens when changes to a solid to a liquid
That is called evaporation when it happens slowly; if it happens more rapidly it is called vaporization.
Vaporization is what happens when a liquid is changed to a gas. When a gas is changed to a liquid it is called condensation.
The temperature at which a liquid changes into a gas is called the boiling point.
This temperature is called the boiling point.
heat..high temperature.. this is called EVAPORATION.
1. in most pure substances, melting occurs at a specific Temperature called the melting point. 2. the change of state from liquid to solid is called freezing (solidification) 3. the change from a liquid to gas is called Condensation.
Solids can be change into liquid by melting for example the ice. It will melt by just minutes in exposure of sunlight.. Liquid can be turned to gas by evaporating. Example a water can evaporate when heated..... :)
Condensation
As the liquid evaporates at room temperature, the system will experience a decrease in the amount of liquid present and an increase in the amount of vapor in the container. This will result in a change in the pressure and temperature within the system as the liquid continues to evaporate.
This temperature is called melting point and is different for each substance or material.
If energy is added to a liquid at 20 Celsius, the temperature of the liquid will increase. This can lead to a phase change if the added energy is sufficient to raise the liquid's temperature above its boiling point, causing it to vaporize. If the added energy is not enough for a phase change, the increased temperature can affect the liquid's properties such as viscosity.