Question 1 Report
Which of the following instrument may be used to measure the relative humidity?
The instrument that may be used to measure the relative humidity is the hygrometer. Relative humidity is the amount of moisture in the air compared to the maximum amount that the air could hold at a given temperature. It is expressed as a percentage. To measure relative humidity, we need an instrument that can measure the amount of moisture in the air. A hygrometer is a device that is specifically designed to measure humidity. There are different types of hygrometers, but they all work based on the principle of measuring the change in some physical property of a substance in response to changes in humidity. For example, a common type of hygrometer is the hair hygrometer, which measures humidity by monitoring the length of a human hair. Hair expands as humidity increases and contracts as humidity decreases. The length of the hair is measured with a scale or a magnifying glass, and the relative humidity is determined from a calibration chart. Another type of hygrometer is the electronic hygrometer, which uses a humidity sensor to measure the moisture content of the air. The sensor consists of a thin film of material that changes its electrical properties in response to changes in humidity. The change in electrical resistance, capacitance, or voltage can be measured and used to determine the relative humidity. In contrast, a hydrometer is a device that is used to measure the density of a liquid. A barometer measures atmospheric pressure, a manometer measures the pressure of a gas or liquid, and a hypsometer measures altitude. Therefore, the correct instrument that may be used to measure relative humidity is the hygrometer.