HIGH and air is humid.Perspiration is maximum when temperature is High and air is humid.As air temperature increases, air can hold more water molecules, and its RELATIVE humidity decreases.When TEMPERATURES drop, relative humidity increases.Hence option 2 is correct.Perspiration, also known as SWEATING, is the PRODUCTION of fluids secreted by the sweat glands in the skin of mammals.Two types of sweat glands can be found in humans: eccrine glands and apocrine glands.The eccrine sweat glands are distributed over much of the body and are responsible for secreting the watery, brackish sweat most often triggered by excessive body temperature.