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.
1 They can damage skin cellsâ DNA directly, and are the main rays that cause sunburns. 2  They are also thought to cause most skin cancers. 3  UVC rays have more energy than the other types of UV rays, but they donât get through our atmosphere and are not in sunlight. 4  They are not normally a cause of skin cancer.