Question

Explain why heat systems based on circulation of steam are more efficient in warming a building than those based on circulation of hot water.

Answer 1

Steam at ${100}^{\circ }$ possesses more heat than the same mass of water at ${100}^{\circ }$. One gram of steam at ${100}^{\circ }$ possesses $540$ calories of heat more than that possesses by $1$ gm of water at ${100}^{\circ }$. That is why heating systems based on the circulation of steam are more efficient than those based on circulation of hot water.