Achemical reaction that absorbs heat from the surroundings is said to be and has a δh at constant pressure.

A chemical reaction that absorbs heat from the surroundings is said to be endothermic and has a positive ΔH at constant pressure.
There are two types of reaction: endothermic reaction (chemical reaction that absorbs more energy than it releases) and exothermic reaction (chemical reaction that releases more energy than it absorbs).
For example, sublimation is an endothermic process, dry ice (carbon(IV) oxide in solid state) is used because of sublimation in nightclubs, fog machines, at theaters, haunted house attractions.

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