what is boiling:
Boiling refers to the action and effect of boiling, which consists of the physical process in which a substance passes, tumultuous way, from the liquid state to the gaseous, with specific pressure and temperature characteristics. It comes from the latin ebullitĭo, ebullitiōnis, and this in turn from ebullire, which means ‘boil’, ‘release bubbles’.
According to physics, boiling takes place when a substance its temperature increases in all of its mass to the point the vapour pressure is equal to the external atmospheric pressure. Within this process, the appearance of bubbles, which rise to the surface, causing the steam, i.e., the transition from liquid to gaseous state takes place.
The specific conditions of temperature and pressure in which the phenomenon occurs is called boiling point. However, this may vary from substance to substance. Alcohol, for example, has its boiling point in the 78 ° C, while iron, to boil, for example, would reach 2,750 ° C, this is due to the fact that first it should reach its melting point (1,535 ° C), i.e., the time which goes from solid to liquid state, for then vaporize. In this way, the temperature of the boiling point may not increase, but it remains constant also constant pressure.
Boiling point is also changed when we go up in the atmosphere, due to variations in pressure. For example, the boiling point of water at sea level is 100 ° C, but as we go up, atmospheric pressure decreases, as well as the necessary temperature to reach the boiling point.
Is also important not to confuse boiling and evaporation (see difference here), since both are different processes.
The term boiling, in addition, can be used in everyday speech to indicate that something or someone is in a State of agitation: “protests today put the streets in boiling”.
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