For example, in the fraction 3/4, the numerator, 3, tells us that the fraction represents 3 equal parts, and the denominator, 4, tells us that 4 parts make up a whole. The picture to the right illustrates 3 4 {\displaystyle {\tfrac {3}{4}}} or Â¾ of a cake.
The Causes of Sunburn Blisters. Sunburn blisters are a result of overexposure to the UVA and UVB rays in the sun. â¢ UVA. These harmful rays penetrate deep into the bottom skin layers and damage the production of new skin cells. High doses of UVA rays will cause sunburn blisters.
Blisters are pockets of fluid that form on the skin, often as a reaction to rubbing, friction or burns. A blister is formed by the body's defence mechanisms to help protect the skin against further damage and to promote healing. Some blisters are caused by conditions such as chickenpox and impetigo. Burns: Flames, steam, or contact with a hot surface can cause blisters, as can severe sunburn or exposure to other types of radiation. 2  Contact with irritants: Skin may blister when it comes in contact with chemical irritants, cosmetics, and many plant and animal toxins.