Environmental testing is the measurement of the performance of equipment under specified environmental conditions, such as: 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, waterproofness, icing presence of corrosive material fungus, fluids susceptibility vibrations, gun fire accelerations solar radiation high and low pressures operating at angles electromagnetic interference, ESD, Lightning acoustic measurements power input variationsSuch tests are most commonly performed on equipment used in military, maritime, aeronautical and space applications. Wikipedia