This machine releases a large amount of heat while operating.

His flaring up again means that he is immersing himself in that hobby again.

His passion for the game flared up again.

It is important to thoroughly heat the meat.

Thermonuclear reactions are the source of the sun's energy.

He understands the basic concepts of thermodynamics.

When the volcano erupted, a glowing cloud covered the sky.

He earnestly desired to get that job.

He earnestly desired that job.

The source of heat for this building is solar energy.