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Why Does Cold Air Fall and Warm Air Rise?
Cold air falls and hot air rises. Why? Talk!
Many of us experience the effects of falling cold air and rising warm air on a regular basis. It occurs in the air above and around us and is one component of our weather system. You may notice that if there is no heating or air conditioning in your home, the upstairs rooms are slightly warmer than the downstairs. Another example is a hot air balloon that fits this principle. By heating the air inside the balloon, the craft will be lighter than the air around it and will rise. This is actually a result of the cold air surrounding the balloon at the same time it rises.
So why does the cold fall? It’s simple: heavier than warm air. And why is it heavier? That’s a little less simple, but only a little. Like any gas, air (a general term for the mixture of gases in our atmosphere), contains molecules that move (or agitate). This movement (or agitation) is greater as the temperature increases. The molecules move in larger orbits, taking up more space. This causes the air mass to expand. Although the total mass of the air bubble does not change, the mass is more spread out and so a given cubic area will be lighter. An analogy is found with popcorn. Half a kilogram of popcorn previous which can fit into the cup. After popping, the same corn will fill the big pot. The total weight will be about half a pound which is usually there, but if you fill the original cup with popped corn, it will weigh less than unpopped corn because the rest will not fit in the cup. . Develop the same hot air. A cup of cold air will weigh more than a cup of hot air.
While we’re playing the why game, let’s continue. Why do molecules move more when it’s warmer? They absorb energy through electro-magnetic waves that smash into molecules. In short, this is the transfer of energy by radiation. So we have a collection (a few trillion, let’s say) of highly agitated molecules and another collection of far less agitated ones. The agitated collection spreads out and thus the light. A less agitated collection is heavier. Heavier objects fall down, while light objects rise.
As well as the main process behind hot air balloons, the movement of air according to temperature is a critical factor with weather. Forecasters must ensure that these movements are taken into account in the modeling system in order to produce good weather forecasts. AC
designers and must also take these factors as architects must. To preserve valuable heat, hot air must be prevented from escaping from the top of the building. In addition to saving heat, the movement of cooler air downwards must also be considered when designing refrigerators and refrigeration systems.
If you have a few minutes, try this experiment. First, make sure that nothing is put in the refrigerator for at least 2 hours. Then, leave the thermometer in the refrigerator, making sure to put it on the bottom and close the door. After 10 minutes, open the door and immediately record the reading on the thermometer. Then put the thermometer on the top shelf and close the door. After 10 minutes, take a reading as soon as you open the door. You will notice a difference – perhaps as much as 1 to 2 degrees. This may not be a big deal for us at home. However, for commercial kitchens, this difference can be critical when it comes to ensuring food stays at the optimum temperature. Commercial refrigerators are often equipped with fans that circulate cooler and warmer air, thus reducing the tendency for cold air to fall and warmer air to rise.
If you take a large freezer store – one with thousands of boxes of stock – air movement around the facility is a very important factor. The fans that blow the frozen air into the store are always near the ceiling, so it spreads downwards. Eventually, of course, the items in the freezer store must be taken out and moved to another location, usually loaded onto a truck. If frozen goods are loaded into a frozen truck this is not a problem. Sometimes, only a few frozen items are needed and the use of large trucks that are set at freezing temperatures will be wasteful if only a few boxes are shipped. This is where insulated pallet shrouds or cage covers come into play. It covers pallets or roll cages, protecting frozen items for up to 8 hours in the ambient environment (it also protects ambient items such as bakery products and bananas in cold or frozen environments). When roll cages are used, it is best to close the insulated roll cage when the cage is full of product. If it’s half full then – you guessed it – cold air falls to the bottom. This is fine at first (assuming the stuff is in the bottom half), but after a while, the warmer air rising to the top will affect the top layer of stuff. This is where temperature insulated dividers should be used to seal and protect
the stuff in the cage is half full.
So now you know why and how the weather is cold and warm and now you also know why your feet get cold in winter!
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