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.

Explanation:

The temperature decreases because kinetic energy means movement of the particle, and movement results in more heat (not specific heat, that's other thing). All this says that, the more movement we have, more heat, which means, higher temperature.

It's the same in the opposite way, the less movement particles have, lower temperature.

So, the correlation is temperature.

which statement about this sum is true? −245+2.7

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