Try these activities and you will “see” heat.
Rub a small amount of water or lotion on your hands to make them slightly moist. Quickly rub your hands together to create friction. Place both hands palms downward onto the smooth, flat surface. Hold them there for at least 30 seconds. Move your hands; observe any evidence of change where they were.
Gently move your hand across the surface. See if you can tell where your hands were originally placed. Were you able to see the original location or did you locate it by feel? Remember you can not see infrared waves.
Next, you will need a heat source such as a stove or microwave oven (adult supervision is required). Carefully pour very hot water into a glass or ceramic cup. Allow the cup to absorb the heat from the water.
Place the hot cup of water into the cool air of the refrigerator. Examine the air surrounding the cup. Are you able to see the waves coming from the hot cup? If these waves were able to increase their frequencies enough they would actually glow and become visible.