00:01
This question asks us to look at the energy involved with making a phase change.
00:07
In other words, the enthalpy of vaporization, the phase change from liquid to gaseous state.
00:12
The question is, why does it require more energy to vaporize water starting at room temperature down here versus when it's at its boiling point up here? and if we kind of look at the heating curve here, it sort of speaks for itself.
00:32
If the amount of energy required to vaporize a sample, starting at room temperature, we really can't vaporize it until it reaches the boiling point temperature.
00:45
So we have to put energy into the process just to get it up to the boiling point temperature.
00:51
If it starts at something below that.
00:54
If we kind of look at this in terms of an equation, the equation for putting heat into, to making a temperature change is dependent on the specific heat of the substance, see, the temperature change, and the amount of substance you have, or the mass of the substance...