Why does cold air move towards warm air?
83198
Particles of warm air are more spread out resulting in less pressure.  Cold air particles are closer together resulting in a higher pressure.  Since air wants to move from an area of high pressure to an area of low pressure, cold air moves toward the lower pressure of warm air.
931522
Newton's law of cooling deviates when there is a large temperature difference between the body and the surrounding (about 30 + degrees) .
362166
That is adiabatic cooling (by expansion). When air is forced to expand (like when it rises) it will become cooler.\n\nWhen air is forcefully compressed, that is adiabatic heating.\n\nThe answer is ADIABATIC TEMPERATURE CHANGES
139451
A front is a boundary between warm and cold air. With a cold front, you have an area of cold air moving into an area of warm air. You can pick them out on weather maps as a blue line with blue triangles. The triangles point in the direction the front is moving. \n\nSince cold air is heavier than warm air, the cold air pushes underneath the warm air, causing the warm air to rise. The warm air then condenses as it reaches cooler altitudes, creating clouds and, eventually, precipitation. \n\nIf the difference in temperatures is very large, you can get a strong front that can create thunderstorms, or even tornadoes. Luckily around here, the Pacific Ocean keeps the temperatures differences to a minimum.
1170375
That could happens in some fans because they come with a special  switch to  change the rotation of the blades. The  warm air always are near the ceiling where the fans is and the cold air is at the floor level.During the winter what the fan do is  generate  a circulation path from  top to bottom like a clockwise movement from the floor to the roof bringing  the heat to the floor; on the  summer, when you switch the rotation,  you invert the process. When you go to the store you can see a diagram on the side of the box that illustrate this...
605559
It does heat up the room, but it has two other effects: the constant stream of relatively dry air it evaporates moisture from your skin faster. Also conduction.  If the air and you are still, the air right next to your skin will be a bit warmer than the air further away, because it is colliding with your warm skin and takes some heat from you, but warms up in the process.  Cooler air blowing past will conduct heat from your skin more efficiently.\n\nThe molecules in water move at a variety of speeds. The "average" speed determines the temperature (it isn't exactly an average, but sort of is) but some move faster and some mover slower.  The faster ones escape and go flying into the room, and that brings the "average" energy of the water left a down a bit. This is why when you are wet after bathing, a humid room feels MUCH warmer than a dry room that is the same temperature; water molecules in the air stick to your skin just as often as the quick ones leave.  In a dry room this does not happen so the net effect is the higher energy (faster) water molecules leave preferentially and what is left is a bit cooler.\n\nIf the air is still, you end up with a bit more water in the air right next to, kind of like being in a humid room.\n\nThe second reason, increased conduction is similar, except the air is warmer right next to your skin because air molecules near your skin tend to collide with the ones IN your skin.  The ones in your skin, being a bit warmer, tend to lose energy to the air.  It cools, and the air warms, BUT conduction is more efficient when the temperature difference is larger. So, once the air next to you warms up a bit, you lose heat energy more slowly. Now, if you have a breeze, there is a steady supply of cooler-than-next-to-your-skin air coming in contact with your skin, so the cooling rate is larger.\n\nYou are correct that the fan will on average heat the room up more, but your body may end up cooler.\n\nThis reminds me of people who sit in front of the refrigerator with the door open on a hot day.  You might feel cooler, but the inefficiency of the fridge compressor means more heat goes into the room than the room is cooled off, but you, being right next to the fridge will be cooler perhaps than otherwise.
18597
To save you some time, here is a great description in plain English:\n\nIt all begins when bitter cold air dives across the Great Lakes. As the cold air flows over the warm water, the relatively warm lake water heats the air's bottom layer as lake moisture evaporates into the cold air.\n\nSince warm air is lighter - less dense - than cold air, the heated air rises and begins to cool.\n\nAs the air cools, the moisture that evaporated into it condenses and forms clouds, and snow begins falling from the cloud if the air is humid enough.\n\nThe wind pushes the clouds over the land. As this happens, friction with the ground, which is greater than the friction between the lake's water and the moving air, slows the winds. This causes the air that's carrying the clouds to "pile up" - meteorologists call this "convergence."\n\nConvergence increases the amount of snow that's falling on the land compared with the amount falling on the lake.\n\nAs the wind continues inland it runs into hills, sometimes only a few miles from the lake, which forces the air to rise, which cools it. As the air cools, more humidity condenses to create even more snow. This is why the heaviest lake effect snow falls on hills inland from the great lakes. \n\nThe source also has an outstanding graphic depiction and explanation.
582102
Air is denser the lower you go on the earth, due to gravity pullin gthe air down. As you move up, there is more "room" for the air to expand. Air temp is just the measure of the net kinetic energy of the molecules of air. The faster and more there are, the hotter it is. therefore, as the air expands as it moves up into the atmosphere, it cools. On top of a mountain, there is less molecules actually hitting your skin, so it feels very cold.
41807
Cold temperatures- like that of ice- slow down molecules and keep them closer together.  Higher temperatures- like that of gases- speed up molecules and let them get lose and fly wherever they want.
333963
Lack of moisture in the air helps static electricity build up.  Cold causes moisture to leave the air.  So, static electricity tends to build up easier in cold climates.
398051
you left out a lot of info lmao.\nwhat is the humidity of the air and what presure are you talking about.\nHeat and cold are regulated by the moisture content of the air.
591876
Warm air holds more water vapor than cold air.  That is why a clothes dryer uses heated air to draw the moisture from the clothes.  It is also why when warm moist air meets cold air it results in precipitation.
385027
Moving air is in a sense a fluid. Air is also a composition of matter (nitrogen, oxygen, etc.). These materials can and do conduct heat. Also heat travels upwards in air. This is because colder air has a different partial pressure.
194124
Because the air spreads out, and as it spreads out it retains less heat.\n\nAnd while cold air does sink and hot air rises, as cold air does get lower in altitude it warms up, and hot air cools as it rises. \n\nI live in the foothills west of Denver so I see the rising/falling air thing firsthand. In the winter we get this air that 50 miles to the west was part of a blizzard. As it descends the mountains, it dries out and heats up sometimes bringing temperatures in the middle of the winter into the 60's or 70's.
1009751
Sunlight heats parts of the atmosphere, other parts remain cold.  This causes pressure differences, and these pressure differences cause a force to be applied to neighbouring air.\n\nGravity also acts upon the air.  \n\nThe earth's rotation causes a drag force on the layer of air touching it.  \n\nEver heard of the coreolis effect?\nhttp://en.wikipedia.org/wiki/Coriolis_effect\n\nI imagine there are other forces too, like internal shear friction, large objects causing wind deflection, the list is probably endless.
1083939
Because moist air is a much better conductor of heat, so draws heat away from you faster in cold weather. And moist air makes it harder for you to lose heat through sweating, so worse in hot weather. Double whammy eh.
238050
All weather is brought about by thermal conditions. Cold as used in the term "cold front" is only a relative term. There is still quite a bit of "heat" in cold air. You must remember all measurements referencing thermal conditions are really a reference to absolute zero where there is no thermal activity.