Temperature is always measured when surface have transition from hot to cold or vice-versa. When molecules decrease in density, implies the individual molecules get cooler/hotter faster to room temp.
hence,
density decreases as air pressure increases
Altitude has a large affect on the air pressure and air density. Air density reduces with altitude and air pressure reduces with altitude as well.
Air density decreases with altitude, warmer temp and moisture
As you ascend in the atmosphere, the air density decreases. This happens because the pressure decreases with altitude, causing the air molecules to spread out, resulting in lower density.
In layman terms, warm air rises and cold air sinks (experience that in a two-story building). Lighter objects float to the top. Therefore, warm air has a lower density than cold air. ===============================
density decreases as air pressure increases
Air pressure decreases as altitude increases. As air pressure decreases, so does density.
Altitude has a large affect on the air pressure and air density. Air density reduces with altitude and air pressure reduces with altitude as well.
The density of air decreases at higher altitudes.
Air density decreases with altitude, warmer temp and moisture
Air density and air pressure are both properties of the atmosphere that are related to each other. As air density increases, air molecules are packed more closely together, which also leads to an increase in air pressure. Conversely, as air density decreases, air pressure decreases as well.
Scroll down to related links and look at "Density of air - Wikipedia". See there: Importance of temperature.
As air pressure pressure decreases with altitude, so does the densite of air.
increases
As you ascend in the atmosphere, the air density decreases. This happens because the pressure decreases with altitude, causing the air molecules to spread out, resulting in lower density.
As air density decreases, the pressure it exerts decreases, but the pressure exerted on it increases.Remember the equation:PV=nRTAnd since n=mass/molar mass,P=nRT/D, density and pressure exerted ON the system have an inverse relationship--as one increases, the other decreases
The density of air decreases with increasing altitude because air at high altitudes is under less pressure.