Take all day with a bush knife; need heat on it.

A different particle that is easier to move will need less heat for the same change in temperature.

She needed the strength and heat of his body.

Families, commerce and industry need heat, light and power at prices they can afford.

"In order to join two different kinds of steel you need intense heat."

This means that they need heat to maintain body temperature.

"We don't need heat," Li says, holding out his hands as if to enjoy the warmth in the air.

He found that fire needs oxygen, fuel and heat.

"If he was right, we won't need extreme heat or cold equipment."

Whatever the case, the house needs efficient central air-conditioning and heat.