Question

describing the properties of air. which statements correctly describe the properties of air? select three options. air has mass but no weight. air pressure is created by the weight of the atmosphere pushing on earths surface. pressure is a measure of how tightly molecules are packed. denser air is heavier than less dense air. air is less dense at higher altitudes.

Explanation:

• Air density decreases with altitude as there is less air above pressing down. So, air is less dense at higher altitudes.
• Denser air has more mass per unit volume and is heavier than less - dense air.
• Pressure is a measure of how tightly molecules are packed. Higher pressure means more tightly - packed molecules. Air pressure is created by the weight of the atmosphere pushing on Earth's surface.

Answer:

Air is less dense at higher altitudes.
Denser air is heavier than less dense air.
Pressure is a measure of how tightly molecules are packed.