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| The boundary or transition zone between two different air masses |
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| A large expanse of air having similar temperature and humidity at any given height. |
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| A high pressure system is a whirling mass of cool, dry air that generally brings fair weather and light winds. |
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| A low pressure system, or "low," is an area where the atmospheric pressure is lower than that of the area surrounding it. |
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| a cyclone is an area of closed, circular fluid motion rotating in the same direction as the Earth |
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| a weather system with high atmospheric pressure at its center, around which air slowly circulates in a clockwise (northern hemisphere) or counterclockwise (southern hemisphere) direction. Anticyclones are associated with calm, fine weather. |
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| Wind is the flow of gases on a large scale. |
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| the degree or intensity of heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch. |
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| In the study of combustion, there are two types ofadiabatic flame temperature depending on how the process is completed, constant volume and constant pressure, describing the temperature the combustion products theoretically reach if no energy is lost to the outside environment. |
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| an instrument for measuring and indicating temperature, typically one consisting of a narrow, hermetically sealed glass tube marked with graduations and having at one end a bulb containing mercury or alcohol that expands and contracts in the tube with heating and cooling. |
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| an instrument for measuring the speed of the wind, or of any current of gas. |
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| a visible mass of condensed water vapor floating in the atmosphere, typically high above the ground. |
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| the height of an object or point in relation to sea level or ground level. |
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| rain, snow, sleet, or hail that falls to the ground. |
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| the pressure exerted by the weight of the atmosphere, which at sea level has a mean value of 101,325 pascals (roughly 14.6959 pounds per square inch). |
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| a quantity representing the amount of water vapor in the atmosphere or a gas. |
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| the boundary of an advancing mass of cold air, in particular the trailing edge of the warm sector of a low-pressure system. |
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| the boundary of an advancing mass of warm air, in particular the leading edge of the warm sector of a low-pressure system. |
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| Continental Polar air masses (cP) are air masses that are cold and dry due to their continentalsource region. Continental polar air masses that affect North America form over interior Canada. AContinental Tropical Air Mass is a type of tropical air produced over subtropical arid regions; it is hot and very dry. |
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| Continental air masses are characterized by dry air near the surface while maritime air masses are moist. Polar air masses are characterized by cold air near the surface while tropical air masses are warm or hot. Arctic air masses are extremely cold. |
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| Maritime polar air masses form over the northern Atlantic and the northern Pacific oceans. They most often influence the Pacific Northwest and the Northeast. Maritime polar air masses can form any time of the year and are usually not as cold as continental polar air masses. |
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