heat quantity

例句：

1. 1.The hot air rises and cools down, reducing the heat quantity.
   热空气上升并冷却，减少了热量。
2. 2.The solar energy is a significant source of heat quantity.
   太阳能是热量的重要来源。
3. 3. The efficiency of the heating system affects the amount of heat quantity it can produce.
   加热系统的效率影响它能够产生的热量量。