Question 788Navigation General

The correct answer is B) hygrograph. A hygrograph is an instrument that continuously records changes in humidity over time. It measures the amount of moisture in the air and produces a graphical record of the humidity levels. This makes it the appropriate instrument for maintaining a continuous record of humidity changes. The other options are incorrect because: A) a thermograph records temperature changes, C) a barometer measures atmospheric pressure, and D) a thermometer only measures temperature at a specific point in time, not continuously.