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GLOSSARY

ALTIMETER: noun; an instrument used to measure altitude
Ex. The altimeter showed that the plane was at 10,000 ft.
Note: alti (high) + meter (measuring instrument)

ANEROID BAROMETER: noun; a type of barometer that does not use
liquid to measure pressure
Ex. He used an aneroid barometer because it was smaller and easier to move from place to
place.
AVERAGE: noun; the total of a column of figures, divided by the

number of items in the column. Also the total length, cost, weight, etc., of a group of items
divided by the number of items

Ex. The average of 4, 5, and 9 is 6.
Ex. The average height of the three men was 5 feet, 8 inches.
BAROMETER: noun; an instrument used to measure atmospheric pressure
Ex. The weather station has two types of barometers.

Note: baro (pressure/weight) + meter (measuring instrument)
BOIL: verb; to use heat to change water to steam
Ex. He boiled water to make tea.

Ex. Water boils at 100°c
.CHARACTERISTIC(S): noun; the feature or features that identify one
thing as being different from another thing
Ex. A characteristic of an inversion is that the temperature increases with height.

CONVERT: verb; to change one thing into another thing
Ex. Inches can be converted to centimeters by multiplying the inches by 2.54.

CONVERSION: the noun form of convert
DETERMINE: verb; to find out or to identify
Ex. The pilot uses his altimeter to determine his altitude.
INVERSION LAYER: noun; a layer of the atmosphere in which temperatures

increase with height
Ex. The air temperature is increasing, we must be climbing
through an inversion layer.
Note: Inversion = noun form of verb "invert," to turn over.
ISOTHERMAL LAYER: noun; a layer of air in which the temperature does

not change with height
Ex. We have climbed 2,000 feet without having any change in the
air temperature; we must be in an isothermal layer.
Note: iso (equal) + thermal (heat)