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17 ) Measure to determine how much longer one object is than another, expressing the length difference in terms of a standard length unit. [2-md4] Local/National Standards:
A hygrometer measures the amount of water vapor in the air, or humidity. The higher the temperature, the more water vapor air can hold. The amount of water vapor in the air co â¦ mpared to what it can hold at a given temperature is called relative humidity.