1 In the mercury barometer, atmospheric pressure balances a column of mercury, the height of which can be precisely measured. 2  Of the many different varieties of mercury barometers, most variations arise from different techniques for measuring the height of the mercury column.
Recognizing the Symptoms of an HIV Rash. 1  1. Check for a rash that is red, slightly raised, and very itchy. 2  2. Note if the rash appears on your shoulders, chest, face, upper body, and hands. 3  3. Pay attention to other symptoms that may occur when you have HIV rash.  4. Be aware of the causes of HIV rash.
HIV rash can occur due to the adverse effect of taking medications for aids. For some people the skin would be peeling on the affected parts with sores formation on the oral cavity and genitals. Other common symptoms of HIV infection are fever, loss of weight, poor concentration, temporary loss of vision and diarrhea. It can also cause joint pain, muscle pain, swollen glands, fatigue and unexplained fever.