THINGS BURN -
An object is said to be hot if its temperature is more than our body temperature. If we touch such an object, heat flows from it to our body and we sense the difference in temperature. In case the object is hotter, it causes pain and may even burn our skin. Similarly, an object is said to be cold if its temperature is lower than our body temperature. When we touch it, heat flows from our body to the object.
We know that our body is made up of molecules., and these molecules are made up of atoms. At normal body temperature, these atoms are in motion or vibrating. The atoms vibrate slowly when cold but faster when hot. When we touch a hot substance with a fingertip, the fast-moving atoms of that hot substance accelerate the motion of the atoms of our fingertip. The molecules at the fingertip suddenly start to vibrate faster, causing pain and a burning sensation. It is the breaking up of the molecules that cause the burning sensation. To repair the damaged cells, blood circulation becomes faster in the affected area, and it is for this reason that the affected part becomes red.
When the temperature of the object touching the body very high, a large number of cells and nerves begin to break up. The hit of the substance dehydrates the cells of the skin and they disintegrate. This is called burning.
Sometimes, very hot substances destroy fats and bones. This causes deeper wounds in the body. The scars caused by such burning are removed by grafting the skin taken from other parts of the body. Burns are classified into four degrees. In first-degree burns, only the superficial layers of the skin become red. In second-degree burns, deeper layers are damaged and blisters are formed. In third- degree burns, all the layers of the skin are destroyed. In fourth-degree burns, not only the skin but also the tissues beneath it are damaged.
Burns are caused not only by heat but also by chemicals, acids, X-rays and radioactive rays.
T
0 comments:
Post a Comment