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jacket in the outside partition for holding water, or other volatile liquid, by which the temperature may be limited exactly to the required degree. -- Vapor burner, a burner for burning a vaporized hydrocarbon. -- Vapor density (Chem.), the relative weight of gases and vapors as compared with some specific standard,…

ing the articles to be galvanized together with zinc dust in an air tight receptacle to a temperature of about 600º F., which is 188º below the melting point of zinc, or by exposing the articles to vapor from molten zinc in a separate receptacle, using hydrogen or other reducing gas to prevent oxidation.…

of a confined body of vapor. The pressure of a given saturated vapor is a function of the temperature only, and may be measured by introducing a small quantity of the substance into a barometer and noting the depression of the column of mercury.

mals, which have warm blood, or, more properly, the power of maintaining a nearly uniform temperature whatever the temperature of the surrounding air. See Homoiothermal.

A device for regulating the temperature of anything subjected to heat, by surrounding the vessel containing it with another vessel containing water which can be kept at a desired temperature; also, a vessel designed for this purpose.

ber surrounding a vessel or tube in which water may be circulated, thereby regulating the temperature or supply of heat to the vessel. Used in laboratory and manufacturing equipment. water- jacketed. Having a water jacket; -- as, a water-jacketed condenser.

A thermometer filled with water instead of mercury, for ascertaining the precise temperature at which water attains its maximum density. This is about 39º Fahr., or 4º Centigrade; and from that point down to 32º Fahr., or 0º Centigrade, or the freezing point, it expands.

hour and over an extended region. Such maps usually show the height of the barometer, the temperature of the air, the relative humidity, the state of the weather, and the direction and velocity of the wind. Isobars and isotherms outline the general distribution of temperature and pressure, while shaded areas indicate t…

formation about the weather. The system used by the United States Weather Bureau includes temperature, cold or hot wave, rain or snow, wind direction, storm, and hurricane signals.

the third order when simpler work is done, as to record rainfall and maximum and minimum temperatures.

One of the five great divisions of the earth, with respect to latitude and temperature.