Explain why the skin of white skinned people turns red in hot conditions?

White skin turns red in hot conditions due to a rush of blood to the surface of the skin, a process called vasodilation. This happens because the body is trying to cool itself down by increasing the flow of blood to the skin, which helps to dissipate heat. The increased blood flow causes the skin to appear red and may also cause it to feel hot and itchy.

This response is more common in people with light skin because they have less melanin, which is the pigment that gives skin its colour. Melanin helps to protect the skin from the sun's UV rays, but it can also inhibit the body's ability to cool itself down. As a result, people with light skin are more likely to experience vasodilation and redness in hot conditions.

In addition to vasodilation, some people may also experience sunburn or heat rash when exposed to hot temperatures. Sunburn is caused by UV radiation from the sun, while heat rash is a type of skin irritation that can occur in hot, humid weather.

To protect yourself from the sun and heat, it is important to wear loose, lightweight clothing, sunglasses, and a hat. It is also important to stay hydrated by drinking plenty of water throughout the day. If you are going to be outdoors for a long period of time, it is also a good idea to apply sunscreen and reapply it throughout the day.