Light
Heat refers to the perception of high temperature or a sensation that is experienced as warm. It can be triggered by external stimuli such as hot objects or spicy food.
Pain is an unpleasant sensory experience that can be caused by various factors, such as injury or inflammation.
Temperature refers to the measure of hotness or coldness of an object or environment.
Thermoreceptors: Thermoreceptors are specialized nerve endings in our skin and other tissues that detect changes in temperature.