boil
water
Boiling.
Most of us would call that "freezing", or possibly "solidification" if we're reluctant to say "freezing" about something that might happen well above normal room temperatures.
No, liquid nitrogen is not a supercritical fluid. A supercritical fluid exists at a temperature and pressure above its critical point where it displays properties of both a liquid and a gas. Liquid nitrogen remains in the liquid state at low temperatures and normal pressures.
No
At temperatures below the boiling point, this phase change is evaporation. Above the boiling point, the liquid boils.
Depends on what you consider normal.
Solid to Gas - sublimation/depositing occurs at temperatures below 0.01°C. Solid to Liquid - melting/freezing occurs at temperatures above 0.01°C and below 100°C Liquid to Gas - boiling/condensing occurs at temperatures above 0.01°C and is complete above 100°C
winter
Above 660.3 oC, aluminium is a liquid. Presuming normal atmospheric pressure.
No. Iron is a liquid at temperatures above 2,800 degrees Fahrenheit.
Not all liquids can be changed into a solid. Only liquids that have the ability to freeze - meaning they have a freezing point above absolute zero - can be converted into a solid. Liquids like water can be turned into ice, but substances like mercury, which remains liquid at extremely low temperatures, cannot be solidified under normal conditions.