A psychrometer is a type of hygrometer and measures what?

Master the Navigation, Seamanship, and Shiphandling (NSS) – Officer of the Deck (OOD) Phase 2 Exam with engaging flashcards and multiple choice questions, complete with hints and explanations. Prepare comprehensively for your test!

Multiple Choice

A psychrometer is a type of hygrometer and measures what?

Explanation:
Measuring how humid the air is (relative humidity) is what a psychrometer does. It’s a hygrometer that uses two thermometers: a dry-bulb and a wet-bulb. The wet-bulb has a wetted wick, so as air moves over it, water evaporates and cools the bulb. The amount of cooling depends on the air’s moisture content. In dry air, evaporation is fast and the wet-bulb temperature drops well below the dry-bulb. In humid air, evaporation slows and the two readings are close. By looking at the difference between the dry-bulb and wet-bulb temperatures, you determine the relative humidity using charts or calculations. So, the instrument’s purpose is relative humidity, not just temperature, wind speed, or atmospheric pressure.

Measuring how humid the air is (relative humidity) is what a psychrometer does. It’s a hygrometer that uses two thermometers: a dry-bulb and a wet-bulb. The wet-bulb has a wetted wick, so as air moves over it, water evaporates and cools the bulb. The amount of cooling depends on the air’s moisture content. In dry air, evaporation is fast and the wet-bulb temperature drops well below the dry-bulb. In humid air, evaporation slows and the two readings are close. By looking at the difference between the dry-bulb and wet-bulb temperatures, you determine the relative humidity using charts or calculations. So, the instrument’s purpose is relative humidity, not just temperature, wind speed, or atmospheric pressure.

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