Question

What is heat?

Answer 1

Heat

• The symbol for heat is $q$ or Q.
• Heat is the form of energy that is transferred between two substances kept at different temperatures.
• When a fuel like methane, or coal burns in the air, the chemical energy contained by molecules can be released as heat during chemical processes.
• We can also change a system's internal energy without the expenditure of work by transferring heat from the environment to the system or vice versa.
• Basically, it is a form of energy with SI unit in Joules (J).