psychrometer etymology

Etymology:

• Greek psychro (ψυχρός) - "cold"
• Greek meter (μέτρον) - "measure"

Meaning:

A psychrometer is an instrument used to measure the humidity of the air.

Origin:

• The term "psychrometer" was first coined in the 19th century by the German physicist Johann Wolfgang von Goethe.

Definition:

A psychrometer measures the relative humidity of the air by comparing the temperature of a dry thermometer to the temperature of a wet thermometer. The difference between the two temperatures is used to calculate the relative humidity.

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