Question 790Navigation General

The correct answer is A) psychrometer. A psychrometer is the instrument most commonly used to gather the data for determining the relative humidity. A psychrometer measures the difference in temperature between a dry-bulb thermometer and a wet-bulb thermometer, which can then be used to calculate the relative humidity. This method is widely used and accepted for measuring relative humidity, as it provides an accurate and reliable way to determine the moisture content in the air. The other options are incorrect because: B) a hydrometer is used to measure the specific gravity or density of liquids, not relative humidity; C) a barometer measures atmospheric pressure, not relative humidity; and D) an anemometer measures wind speed, not relative humidity.