How is heat involved in changing the phase of a substance from solid to liquid to gas?

Ahypothesis is? close agreement by competent observers of observations of the same phenomena. a guess that has been tested over and over again and always found to be true. an educated guess that has yet to be proven by experiment. the long side of a right triangle. a synthesis of a large collection of information that includes guesses.

In a system, when potential energy decreases, then entropy also decreases. true false

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?