Answer:
(c) by increasing it's mass
Boiling is the process of converting a substance from liquid state to gaseous state. If the heating curve is reversed, the process also is reversed from converting gaseous state to liquid state. In this case, the reverse of boiling is condensation. So the answer is point of condensation.
1.6456 x 10^3 (ten to the third power)
4 is correct for this one
