Most of the information about "heat" is usually related to "the particle theory", so you may keep that in mind.

For a century and a half, then, the particle theory held fast.

His reputation helped the particle theory of light to hold sway during the 18th century.

The particle theory of light had returned - with a vengeance.

That discovery alone would have wide implications for particle theory.

One cannot imagine a comprehensive particle theory without several forms of matter.

How does the photoelectric effect support the particle theory of light?

He picked and pried at particle theory, but it was no use.

Every major figure in particle theory has jumped into the arena.

Even though no individual particles were ever actually seen, this particle theory was acceptable to many people.