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.
After contracting HIV, it is true that some people will have symptoms of a condition known as either acute retroviral syndrome (ARS) or primary HIV infection. People with primary HIV infection can experience a wide range of symptoms similar to those of the flu. These include: 1  fever. 2  sore throat. 3  rash. 4  fatigue. 5  swollen lymph nodes. 6  joint pains and muscle aches. 7  diarrhea. 8  weight loss. 9  neurological symptoms, e.g., memory loss.