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Generally, the composition of the air in the high and low temperature test chamber can be regarded as being composed of three components: dry gas, water vapor, and dust. Absolute temperature is the quality of water vapor contained in pitch gas under certain working pressure and temperature. Saturated humidity is the greater water vapor quality that the enterprise gas can contain under this standard. In temperature markets, the more water vapor that can be contained in the air, the greater the saturated humidity. The ratio of absolute humidity to saturated humidity is the air humidity. If you persist in the humidity of the gas and lower the temperature of the gas, when the temperature is low to a certain value, the partial working pressure of water vapor reaches the saturation pressure that matches the gas temperature at that time, and the water vapor in the air under this standard reaches saturation. state. If the gas temperature is further reduced, water vapor will precipitate out of the air to form "dewdrops." This kind of phenomenon is called "essence lotion".
In the high and low temperature test box and other temperature experiments, the reason for the product essence is that when the working temperature of the high and low temperature test box rises, due to thermal inertia, the temperature of the surface of the product is lower than the working temperature, and when the damp and hot environmental quality is less than the leakage point On the surface of the product, water vapor will solidify on the surface to produce dew drops. Moreover, if the product is tightly sealed, when the working temperature of the high and low temperature test box decreases, the temperature of the internal cavity of the product box decreases faster than the temperature of the cavity body gas, and the hot and humid gas in the cavity will solidify into dew droplets in the cavity of the product casing. Because most of the products are not completely sealed, the essence of the essence usually appears in the warming stage.
 The efficacy of the essence is related to the common raw materials of the product, the size of the cavity, the temperature and speed of the elevator, and the air humidity. The poorer the heat absorption reactivity of the raw materials, the larger the inner cavity, the faster the temperature of the elevator, and the greater the air humidity, the more powerful the essence of the essence. If any one of the criteria for the production of essence is destroyed, the production of essence can be avoided.
Under normal circumstances, the original characteristics of the commonly used raw materials and inner cavity size of the high and low temperature test chamber and the selection of the temperature stability limit, the temperature stability low limit and the temperature speed of the elevator have long been clear in the early stage.