Touch both objects. They are the same temperature, but wood feelings Warmer, right? Why is it? It’s not about temperature, but thermal energy. When the hand touches the object, the heat conduction interaction takes place. The energy is transferred from the warmer hand to the cooler object until both are not at the same temperature. However, in the case of a metal block, it requires much more energy to reach the temperature of the hand. He feels cooler because it causes the hand to lose more energy.
You will notice the same when you swim. The air temperature 75 ° F is nice and comfortable, but wading in water at the same temperature is really chilly. This is because the water has a much higher mass and heat capacity proper than the air, which makes you lose more heat and feel colder.
All the blankets frosty
Blankets, how do they work? The blanket is basically an insulator. This means that it prevents transfer of energy between objects at different temperatures. Wrapping in a blanket on a chilly day prevents you from losing your body heat in the air around you, thanks to which you feel warmer. Similarly, if you put a blanket around the chilly soda on a toasty day, will leisurely down the heat transfer from the air to soda, keeping soda Frigid longer.
But what if you feel heated and put on a blanket? In this case, two things can happen at the same time. It can still act as a thermal insulator and leisurely down energy transfer between you and air. While the air of the environment exceeds 98.5 ° F, it will make you warmer, not cooler.
However, the blanket may also have thermal interaction with the body. Let’s assume that you have 80 ° F blanket with 98 ° F in contact. It will raise the blanket temperature, while reducing the heat of the body. Yes, it will act as a cooling blanket – for at least a few minutes, until the temperature is even.
What makes one blanket frosty more effectively than another? First of all, it should have a high mass to toasty up a lot of energy. Secondly, the blanket must make good contact with the skin to boost thermal interaction. So one of those lightly fluffy blankets will not cook you so much. Besides, it is an ordinary blanket.
But I am a loser to try these things, so I bought a economical “cooling blanket” online. (I know, someone will say that it does not work until you get a road.) For those who claim that their cooling blanket was in the sun and measured the temperature of 75 ° F, I do not believe you. Check it out. I have three blankets on the sofa. One of them is a cooling blanket and others are normal. On the back there is the same photo with an infrared camera, thanks to which different colors represent different temperatures.