The reason for the statement that a cooling sensation is felt when the doctor sprays a liquid on the skin before injecting a painkiller is to be explained. Concept Introduction: The physical process involving phase change can also be endothermic or exothermic. The latent heat required for phase change is either taken from the surroundings in case of an endothermic process or it is released to the surroundings in case of an exothermic process.

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Chapter 6, Problem 69QP

Interpretation Introduction

Interpretation:

The reason for the statement that a cooling sensation is felt when the doctor sprays a liquid on the skin before injecting a painkiller is to be explained.

Concept Introduction:

The physical process involving phase change can also be endothermic or exothermic.

The latent heat required for phase change is either taken from the surroundings in case of an endothermic process or it is released to the surroundings in case of an exothermic process.

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