Cool in winter and cool in summer! Scientists have invented a method that automatically adjusts temperature based on body temperature

This is one of the frustrations that every day in life: wearing a pullover, but because of too hot, has to take off again.

But scientists may now have the answer – a self-cooling pullover coat.

The change of heat energy through clothes can be achieved in three ways: one is conduction, which transfers heat by atomic interactions in matter; the other is convection, when high-energy atoms move in the environment, convection generates heat; the last is Radiation, which allows heat to move like electromagnetic waves, can also produce heat. Clothing can change the degree of human air circulation, or spread the amount of radiation to the body, thus controlling the body's heat and helping you find the right temperature.

The researchers invented a material that automatically heats up when it feels too cold.

But it also detects their warm enough temperature and releases heat to maintain the perfect temperature.

The clothes are made of ordinary wool, which has been used in sportswear but is covered with an ultra-thin conductive metal.

Its creators claim that it is much better than the existing breathable sportswear, which can change body temperature by 35%, while existing clothing can only change by 5%.

This material can be cleaned like a regular pullover and is expected to cost around £4 ($5).

Professor Min Ouyang from the University of Maryland helped make the material. He said: "The purpose of making this material is to ensure that people can maintain comfort."

“They don’t need to take off their clothes and then put on their clothes, trying to reach a comfortable temperature.”

“If someone is sitting in the office and feels very hot, they don’t need to turn on the air conditioner or change clothes. This kind of textile can adjust the temperature for them.”

Researchers use already available wool for high-performance sportswear as a starting point.

It is coated with carbon nanotubes, which are only a millionth of a human hair.

The fabric underneath the metal can detect if there is an increase in body temperature because their skin becomes damp due to sweat.

This causes the fibers to shrink and get closer together, creating a charge that drains heat from the body.

But if someone feels a little cold again, the material will swell and the metal will absorb heat from the outside air.

Previous attempts to make cool clothes included "air conditioning" jackets from Japan and two fans on the back.

But the latest inventions don't require batteries, they only need to work through natural physics.

According to Science, the fabric works almost instantly, so their clothes begin to cool down as soon as they realize they are getting hot.

Professor Youang said: "The human body is a perfect radiator. It emits heat quickly.

Throughout history, the only way to adjust the radiator is to take off or put on your clothes. But this new fabric is a true two-way regulator.

Ray Baughman, a professor of chemistry at the University of Texas, who was not involved in the study, said: "This groundbreaking work provides exciting new switchable features for comfortable garment adjustment."

Scientists have woven this fabric into a piece of fabric that is nearly 5 square feet (about 3 square meters). A fabric company in the United States will test the fabric and is expected to go public within two years.