Pressure is the weight or force that is produced as one thing pushes against another. Pressure can also be used to refer to the weight of air in the Earth's atmosphere.
If someone has a cut or another type of open wound, it is important to apply pressure to the area to prevent blood loss.
At high altitudes, water boils at a lower temperature because the atmospheric pressure is lower.
To pressure means to apply force to someone or something, and the force applied does not have to be physical. The expression under pressure is used figuratively to describe a situation in which someone is facing a deadline or some other type of pressure to get something done.
Abhi's parents had been pressuring him to become a doctor since he was a kid, but when he got to college he decided that he would study engineering instead.
Claire is under a lot of pressure at the moment because she has a deadline for a huge project coming up soon.
The ozone layer is a layer of the stratosphere where there is a high concentration of ozone, a form of oxygen that absorbs solar radiation.
If the ozone layer did not exist, more harmful rays from the Sun would reach the Earth, making it very difficult for living things to survive.
While the ozone in the ozone layer helps living things by absorbing radiation, when ozone is found in the troposphere, which is the layer of the atmosphere that is closest to the ground, it is a health risk.
The radiation absorbed by the ozone layer is called ultraviolet radiation or ultraviolet rays, or UV rays for short. UV rays are invisible rays coming from the sun that cause skin cancer.
Researchers have identified two types of UV rays that cause skin cancer; the type¬A UV rays are less intense but more common than type¬B UV rays.
Reducing exposure to ultraviolet radiation is the best way to prevent skin cancer. People can reduce their exposure by using sun cream, limiting time outside during the middle of the day, and wearing clothing made from materials with a sun protection factor.