: How does coolant work in an automobile or air-condition or in machines?

Question

And also why can’t we use nitrogen instead of coolants ?

In: Chemistry

Answer 1

Coolant in ACs is a speical gas/liquid that changes phases from liquid to gas at room temperature and back depending on the pressure. This phase change takes some energy which comes from the air around the cooling coil, that heat is then released at the point where you want to put it, so outside where the coolant is forced to change back to its liquid form with a compressor. For automobiles its just water running near hot parts and cooling down in a circle and you could in theory use nitrogen but its just very impractical.