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It has to do with the Laws Of Physics. Air that is moving fast or at a low pressure has a lower relative temperature than air that is not moving or at a higher pressure.
This is why air at high altitudes is very cold, even on a warm summer day. You will also notice this chilling effect when you spray air from a high-pressure hose, a spray-can for cleaning off machinery, keyboards, etc., or even from a fire extinguisher, as the nozzle gets very cold and can even form a layer of frost on the surface. In extreme conditions this icy layer can block the hole the air is coming from and you will have to wait until it thaws before you can continue.
When you force air from your lungs while constricting your lips to a small "o" shape, you are accomplishing both pressure change and speed change because the air is exiting your mouth at a high rate of speed, and the air pressure inside your mouth is higher than the air pressure outside your mouth. This makes the air exiting your mouth seem colder than usual. If you open your mouth wide and simply exhale gently, there is very little pressure change or speed added to the air movement, so the air you are exhaling reflects the warmth within your body.
What else can I help you with?
What produces the sound of a piccolo?
air that is blown across the mouth hole.
What acts to compress the wall of the cheeks when air is blown out of the mouth?
The buccinator muscle, located in the cheeks, contracts to compress the cheeks when air is blown out of the mouth. This muscle helps in actions such as blowing out candles or whistling.
Where do internal nostrils open?
The internal nostrils of the frog open into the frogs mouth. When the nostrils open it allows air to enter the enlarged mouth.
Why blown air from the mouth hot?
Because it's been in the body, and has taken up the temperature of the body.
Where do the internal nostrils opens?
The internal nostrils of the frog open into the frogs mouth. When the nostrils open it allows air to enter the enlarged mouth.
What can a flute be compared to?
Well a flute can be compared to a recorder because they are both played by blowing air out of your mouth to produce sound. The difference is just that a flute is blown ACROSS and a recorder is blown INTO.
What happens with you sniff with your mouth wide open at the same time?
Nothing, you still take air in through your nose and not through your mouth. When ever you sniff with your mouth open your tongue will automatically go to the roof of your mouth to block air flow, try it right now,see what I mean.
How can you control your blowing being cold and hot?
blowing cool air, is the air only in your mouth... warm air comes from your lungs. temperature also varies by how open your mouth is while blowing air out
Can balloons blown up by mouth fly?
Balloons blown up by mouth can fly briefly due to the air pressure inside causing them to float for a short period of time. However, they will eventually lose air and fall back down. helium-filled balloons are typically used to make them float for longer periods.
What is the best way to open an airway of an unresponsive victim with no neck injury?
Tip their head back 45 degrees and open their mouth up. Put your ear near their mouth to be sure air is flowing in and out. Shazam! Instant air.
Why do we close the mouth of an inflated balloon?
Closing the mouth of an inflated balloon helps to keep the air trapped inside. If the mouth is left open, the air can escape and deflate the balloon. Closing the mouth also helps to create pressure inside the balloon, keeping it inflated.
Will having a window slightly open improve auto air conditioner efficiency?
No. A major benefit of AC is removing the humidity from the air. Lower moisture levels (dry air) contribute as much to your comfort as the cold air blowing on you. With the window even slightly open more moist air is entering the vehicle than the AC can keep up with.
