Question

why do particles speed up when heat is added?
a heat adds pressure which is a form of energy.
b heat decreases the kinetic energy of the particles.
c heat is a form of energy.
d heat is measured by temperature which is a form of energy.

Explanation:

• Heat is a form of energy. When heat is added to a substance, the particles gain energy. Kinetic energy is the energy of motion. As the particles gain energy (in the form of heat), their kinetic energy increases. An increase in kinetic energy means the particles move faster (speed up).
• Option a: Heat is not pressure. Pressure is a force exerted per unit area. Heat is thermal energy. So this option is incorrect.
• Option b: Heat increases the kinetic energy of particles, not decreases. So this option is incorrect.
• Option d: Temperature is a measure of the average kinetic energy of particles. Heat is energy transfer due to temperature difference. Temperature is not a form of energy. So this option is incorrect.

Answer:

C. Heat is a form of energy.