When one cracks a knuckle, the stretching of the capsule lowers the pressure inside the joint and creates a vacuum which is filled by the gas previously dissolved in the synovial fluid. This creates a âbubbleâ which then bursts producing the characteristic âpoppingâ or âcrackingâ sound.
DOCTORS: Click here for the Professional Version. Burns are injuries to tissue that result from heat, electricity, radiation, or chemicals. Burns cause varying degrees of pain, blisters, swelling, and skin loss. Deep, extensive burns can cause serious complications, such as shock and severe infections. Small, shallow burns may need only to be kept clean and to have an antibiotic cream applied.
Its depends on long you have been exposed to the sun and the intensity of the rays.I. Sunburn is a burn on the skin and a type of skin disorder. It results from overexposure to the harmful UV rays of the sun. The consequence of this burn is inflammation of the skin. Injury can start within 30 minutes of exposure.