liters (volume)
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The metric unit for air pressure is the Pascal (Pa).
The metric unit typically used to measure the mass of a feather is grams (g). Feathers are very light, so their mass is usually measured in milligrams (mg) or grams (g).
A humidastat works with a cooling unit or humidify. It measures the amount of humidity in the air. This can then trigger the unit to turn on or off removing excess humidity from the home.
Air pressure is the metric used to measure how heavy the air is. It is typically measured in units like millibars or inches of mercury using a barometer.
The Dobson unit (DU) is used to measure the total amount of ozone in the Earth's atmosphere. It is a unit of measurement for the total column thickness of ozone in a vertical column of air from the surface to the edge of space. Researchers use specialized instruments like spectrophotometers to measure the concentration of ozone in the atmosphere in Dobson units.