$$A solid melts

$-$abcde$$Total energy is constant in an isolated system

$-$abcde$$Calorie

$-$abcde$$The temperature of a material decreases

$-$abcde$$A liquid freezes

$-$abcde$$A gas condenses

$-$abcde$$Study of heat and energy

$-$abcde$$Energy can change from one type to another

$-$abcde$$The temperature of a material increases

$-$abcde$$Energy is absorbed

$-$abcde$$A liquid boils

$-$abcde$$Energy is released

$-$abcde$$Joule

$-$abcde$$Energy cannot be created or destroyed

Heat is released by system $(-$q$)$

Unit of Energy

Heat is gained by system $(+$q$)$

First Law of Thermodynamics

Thermodynamics