Exothermic means that the temperature of the object itself decreases, and the temperature of the outside world increases. The exothermic in physics includes liquefaction, solidification and sublimation in the change of state of matter.
Exothermic means that the temperature of the object itself decreases and releases heat to the outside world to raise the outside temperature. Exothermic in physics The exothermic in physics includes liquefaction, solidification and condensation in the change of state of matter. The heat release in physics has certain applications in life. For example, northerners often put several barrels of water in the vegetable cellar in winter, which makes use of the heat release when the water solidifies to prevent the vegetables from freezing. Exothermic reaction in chemistry exothermic reaction in chemistry roughly includes: (1) combustion, such as C+O two ==Ignition==CO two ； (2) Neutralization reaction, for example: NaOH+HCl==NaCl+H two O； (3) Metal reacts with acid to generate hydrogen, for example: Mg+2HCl==MgCl two +H two ↑； (4) Slow oxidation; (5) Most chemical reactions; (6) Aluminothermic reaction, e.g. 2Al+Fe two O three ==High temperature==2Fe+Al two O three ； (7) Quicklime reacts with water: CaO+H two O==Ca（OH） two ； (8) Alkali metal reacts with water, e.g. 2Na+2H two O==2NaOH+H two ↑。
