Scot wrote:Generally cold cold means 'thinner air' so when you climb up to Mount Everest, you need oxygen tanks, because your body needs more oxygen and get enough from the thinner air
Complete and utter tosh. The air is thin on the top of Everest because you are 29,000 feet above sea level and therefore atmospheric pressure is less, making the air less dense, making it less able to conduct heat effectively. Air is very poorly heated by the sun, and instead warmth is provided to the earth by sunlight falling onto the ground, which then radiates it back into the air, warming it. Very little ground at 29,000 feet, less air to conduct heat effectively, .: the air is colder.
You need oxygen tanks because, as mentioned, there is less atmospheric pressure - not enough to force sufficient quantities of oxygen into the lungs in order for pulmonary respiration to effectively take place.
All
other things being equal, cold air is
more dense than hot air - this is why steam rises from a saucepan in a cold kitchen! If you *really* want to prove yourself wrong, take a plastic bottle, partially fill it with water from the hot tap, swirl it around and then screw the lid on tight. Then submerge it in a bowl of cold water.
The bottle will crumple and contract - the air inside the bottle, heated by the warm water, is cooled rapidly by the bottle's immersion in cold water. The air cools, energy is taken out of the system and the level of entropy in the bottle drops. The air becomes cooler, more dense, and therefore (because it is a gas) reduces in volume. This reduction is sufficient to cause the plastic bottle to gave in on itself...
Scot, I'm sadly disappointed in your science!
