Environmental tests are used to verify a piece of equipment can withstand the rigors of harsh environments, for example: * extremely high and low temperatures * large, swift variations in temperature * blown and settling sand and dust * salt spray and salt fog * very high or low humidity * wet environments * fungus * vibrations (airborne and structural) * accelerations * solar radiation * high and low pressures (especially for aeronautical and space equipment) * operating at angles (especially for marine, aeronautical and space equipment) * electromagnetic interference (EMI)