## Heating Curves

$\Delta U=q+w$

swatiperepa
Posts: 19
Joined: Wed Sep 21, 2016 2:59 pm

### Heating Curves

Is it necessary for us to understand heating curves? If so, can someone please explain to me what the heating curve is trying to show?
I was looking at the one in the textbook in Chapter 8 (Box 8.1) and it was confusing me. (It's the one with "Differential Power" as the y-axis and "Temperature" as the x-axis.)

Molika Soben_3J
Posts: 27
Joined: Wed Sep 21, 2016 3:00 pm

### Re: Heating Curves

I think it would be beneficial to know and understand what a heating curve is. A heating curve is a graph showing the temperature of a substance (y-axis) plotted against the amount of energy it absorbs (x-axis). A substance must absorb heat energy so that it can melt or boil. The temperature of the substance does not change during melting, boiling or freezing, even though energy is still being absorbed, so during those points of phase changes, the graph or curve is a flat horizontal line. And where the graph is increasing, energy absorbed increases with temperature. You can look at figure 8.26 in the textbook on page 827.