Explanation has to be given for the observation- “A liquid gets cooler when it evaporates from an insulated container”. Concept introduction: The phenomenon of evaporation of liquid is transition from “ liquid phase ” to “ vapo r phase ”. Almost all the liquids have the tendency to evaporate either spontaneously at room temperature without the effect of “ external energy ” or in the presence of external energy like heat etc. Since evaporation occurs by the process of absorbing heat from the surroundings, it is an endothermic process. Insulation is a process in which there is no transfer of heat or any other form of energy from one body to the other or surroundings.

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Chapter 9, Problem 17Q

Interpretation Introduction

Interpretation:

           Explanation has to be given for the observation- “A liquid gets cooler when it evaporates from an insulated container”.

Concept introduction:

          The phenomenon of evaporation of liquid is transition from “liquid phase” to “vapo r phase”. Almost all the liquids have the tendency to evaporate either spontaneously at room temperature without the effect of “external energy” or in the presence of external energy like heat etc. Since evaporation occurs by the process of absorbing heat from the surroundings, it is an endothermic process.

         Insulation is a process in which there is no transfer of heat or any other form of energy from one body to the other or surroundings.

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