Question

how do we know whether an object is hot ot cold

Answer 1

How do we feel hot or cold?

Thermoreceptors detect temperature changes. We are equipped with some thermoreceptors that are activated by cold conditions and others that are activated by heat. Warm receptors will turn up their signal rate when they feel warmth—or heat transfer into the body.

Answer 2

by touching or air present around an object feel u that object is called or hot