Which of the following may be used to determine the relative humidity in a physics laboratory I. Manometer II. Wet-and-Dry Bulb Hygrometer III. Hair Hygrome...

Which of the following may be used to determine the relative humidity in a physics laboratory I. Manometer

II. Wet-and-Dry Bulb Hygrometer

III. Hair Hygrometer

IV. A Hydrometer