Question 1129Navigation General

The correct answer is B) relative humidity. A hygrometer is a device used to measure the amount of water vapor or moisture content in the air, which is known as relative humidity. Relative humidity is the ratio of the actual amount of water vapor in the air to the maximum amount of water vapor the air can hold at a given temperature. This is the primary function of a hygrometer, making it the correct answer. The other options are incorrect because they do not accurately describe the purpose of a hygrometer. A hygrometer is not used to measure atmospheric pressure (A), wind velocity (C), or absolute temperature (D), which are measured by other specialized instruments.