The latent heat of water melting is the highest among all substances except for ammonia and hydrogen, and latent heat of evaporation is the highest of all substances.
As it follows from hypotheses, it is necessary to spend a plenty of energy to transfer it from a liquid condition into vaporous or from firm in liquid (for destruction of its intermolecular structure). This energy is called the latent heat of evaporation or thawing. To transform ice into water, it is necessary to spend 332,43 J on 1g, and for transformation of the same amount of water in steam it is required 2258,5J. At return transitions - transformation pair in water and water in ice -an equivalent amount of heat is allocated from each gram of water.
The evident representation about this energy is given by such a comparison: 1g of water allocates at freezing approximately as much heat, as it is got at burning of 10 kg of coal. During spring and autumn seasons there is (at the expense of the latent heat of melting (freezing))an exchange of such an amount of heat, which is equivalent to 2*1011 tones of burnt coal, that is much more, than its annual extraction all over the world.
