Because its latent heat is partly drawn off by the surrounding air.
The latent heat of the iron or the stone is set free by the violent percussion.
Are there any instances in which the abstraction of latent heat will reduce the hulk of bodies?
Call to mind what was said of the formation of vapor when we were speaking of latent heat.
You will need, therefore, to study carefully this subject of latent heat.
That is the old and common expression, but what is meant by latent heat?
The latent heat of steam at 90 pounds gage pressure is 881 heat units.
This second quantity is called the latent heat of the steam at 100°.
Because the latent heat of the water passes away from between its atoms into the air; the atoms, therefore, draw closer together.
The sudden compression of air liberates its latent heat, and produces fire.