Abstract: A concentration correcting apparatus comprising a correction coefficient calculating means and a correcting means is shown and described. The correction coefficient calculating means calculates a correction coefficient for correcting the concentration of the material when the actual density of the medium at the measurement of the material is calculated in terms of the density of the medium under the reference temperature and pressure, from the results of the temperature measuring means and the pressure measuring means. The correcting means corrects the results of the material measuring means to a concentration under the reference temperature and pressure on the basis of the correction coefficient.

Abstract: An air conditioner for an automobile uses a non-azeotropic mixture refrigerant. The air conditioner has an evaporator for evaporating the refrigerant and cooling air passing through the evaporator. The air has a temperature slope after passing through the evaporator. An air dividing damper disposed downstream of the evaporator divides the cooled air into cold air and not-so-cold air for use in various ways in the passenger compartment.

Abstract: A refrigerant apparatus having a compressor, a condenser, an expansion value, evaporator and an oil repellent coat. An oil repellent coat is coated inside of a low pressure refrigerant passage which lubricant is easy to adhere so that lubricant is prevented from staying inside of the refrigerant passage. Since the oil repellant coat is low affinity for oil, luricant forms guttulate on the oil repellent coat by surface tension. Since the guttulate is easy to move on the inside wall with a flow of the refrigerant, it is prevented lubricant from staying on the inside wall.

Abstract: The automotive air conditioner uses a plurality of groups of coolant having different boiling points. The air conditioner uses both the lower boiling point coolant and the higher boiling point coolant when the air conditioner requires high cooling efficiency. The air conditioner separates the lower boiling point coolant from the higher boiling point coolant when the air conditioner does not require high cooling efficiency. In order to separate the lower boiling point coolant, the air conditioner has a rectifying circuit on which a controlling valve, a first pressure reducing means, a rectifying means, a second pressure reducing means and a heat exchanger is provided. The amount of coolant passing through the rectifying circuit is controlled in accordance with the temperature of the coolant downstream of the heat exchanger.