If an endothermic reaction is taking place in a test tube, the temperature will decrease which can be felt when we touch the outside of the test tube.
An Exothermic reaction is a chemical reaction which involves the release of heat energy in the surroundings. The temperature of the surrounding resultantly increases.
An endothermic reaction is a type of of chemical reaction in which energy is absorbed from the surrounding. This results in a decrease in the temperature of the surroundings. When an endothermic reaction takes place in test tube the temperature of the surrounding, which is the wall of the test tube, will decrease and this can be felt by touching the outside of the test tube.
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