When the kinetic energy of particles in a substance decreases, what also decreases? the size of the particles in the substance. the number of particles in the substance. the substance’s specific heat. the substance’s temperature.

The correct answer is the substance’s temperature.

Explanation:

Average kinetic energy is defined as the average of all the kinetic energies of the particles that are present in a system. It is given by the equation:

where,

E = Average kinetic energy

R = Gas constant

T = Temperature of the system

= Avogadro's number

From the above relation, average kinetic energy is directly related to the temperature of the system. So, decrease in kinetic energy of a substance also decreases the temperature of the substance.

Hence, the correct answer is the substance’s temperature.

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explanation: