Question

The amount of heat energy transfer required to transform one kilogram of water at its boiling point into steam is called the

Answer 1

Latent heat of vaporization.

1 g of water at 100 C becomes 1 g of steam at 100 C after adding 540 calories to the water - likewise 1 g of steam at 100 C emits 540 calories when converted to 1 g water at 100 C