Are those “covered with viral” cooling “?

Touch both objects. They are the same temperature, but the wood feel Warmer, right? Why? It is not a matter of temperature but thermal energy. When your hand touches an object, there is an interaction with heat management. The energy is transferred from the hottest hand to the coldest object until the two have the same temperature. However, with the metal block it takes much more energy to reach the temperature of the hand. It seems fresher because it makes you lose more energy in your hand.

You will notice the same thing when you go swimming. A 75 ° F air temperature is beautiful and comfortable, but to wade in the water of the same temperature seems really cold. This is because the water has a much higher mass and a specific thermal capacity of the air, which makes you lose more thermal energy and feel colder.

All fresh blankets

So, blanks, how do they work? A blanket is basically an insulator. This means that it prevents the transfer of energy between objects at different temperatures. Wrap in a blanket on a cold day prevents you from losing body heat in the air around you, so you feel hotter. In the same way, if you put a blanket around a cold soda on a hot day, it will slow down the transfer of thermal energy from air to the air, keeping the soda Cold longer.

But what if you feel hot and put a blanket? In this case, two things can happen simultaneously. It can still act as a thermal insulator and slow down the transfer of energy between you and the air. Unless the air air is exceeding 98.5 ° F, this will make you warmer, no longer cool.

However, the blanket can also have a thermal interaction with your body. Suppose we have a blanket of 80 ° F in contact with a person of 98 ° F. This will increase the temperature of the blanket by reducing the thermal energy of your body. Yes, it will act as a cooling blanket, at least for a few minutes, until the temperatures are fairly fair.

So what makes a fresh blanket more effectively than another? First of all, it should have a high mass, so that it takes a lot of energy to warm up. Secondly, the blanket must establish good contact with the skin to increase thermal interaction. So, one of those soft light hands do not cool you so much. Apart from this, it is just a normal blanket.

But I am a suction cup to try these things, so I bought an “economic online cooling blanket”. (I know, someone will say that it doesn’t work if you don’t get an expensive one.) For those who say that its cooling blanket was out of the sun and measured a temperature of 75 ° F, I don’t believe you. Take a look. I have three blankets on my sofa. One of these is the cooling blanket and the others are normal. In the rear is the same photo taken with an infrared camera so that different colors represent different temperatures.