When hot and cold air meet, the warm air rises above the cool air, creating a low pressure zone. Warm air tends to cool as it reaches higher elevations, with the liquid in it condensing and forming clouds and rain. Cool air rushes in to fill the low pressure zone, pushing more warm air up and creating a cycle that can result in high winds and storms.Know More
The area where a warm and cold air mass meets is called a front. The severity of weather conditions at a front is determined by the direction of the cold and warm air movement. When warm air is on the move and it collides with a stationary cold air mass, the warm air rises gradually, forming drizzle and light rain. If cold air collides with a stationary warm air mass, the results are more severe. The cold air forces the warm air mass up quickly, creating large, sometimes violent thunderstorms with torrential rains. The air masses must reach equilibrium before the storm can dissipate, allowing clearer skies to prevail.
Warm and cold air masses are caused by uneven heating of the Earth by the sun. Colder air masses originate at the poles, with warmer air masses forming in the tropics.Learn more about Atmosphere
As altitude increases, the air pressure decreases. The surface of the earth is the bottom of an ocean of air. The layers on top increase pressure so that at sea level a body is under 14.7 pounds of pressure per square inch. Moving up in altitude decreases weight of air that causes the pressure. At 18,000 feet, the pressure decreases to 7.4 pounds of pressure per square inch.Full Answer >
Hot-air balloons work based on the principle that hot air is lighter than cool air. By using a propane burner that heats the air inside the balloon, the air inside the envelope, or the top part of the balloon, becomes lighter than the surrounding air, causing the balloon to rise.Full Answer >
Cold air return vents work by allowing cool air to be suctioned into a furnace or heating/air conditioning system. The cool air is then heated or cooled, depending on the system setting, and forced back out into the home or building.Full Answer >
An electric heater might blow cold air because the thermostat is set too low or is not working properly, the air has not had enough time to warm up yet or there is leaky or blocked duct work. Most of these are easily determined and corrected by the homeowner.Full Answer >