What's the right way to use air conditioners?
Is it recommended to keep turning it on and off as the place needs cooling? or should it be set to a certain temperature and leave it on? what is more economic/practical?

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How do I clean an air conditioner?
We got a used air conditioner from a family member recently (we are tight on money) and while it works great it is a little dirty and has some rust on it. Before we put it in the window I want to clean it. How can I really clean an air conditioner?

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Need help in Physics!?
1. If you hold the bottom of a water-filled test tube and heat the top of that tube with a flame, the water inside will boil while your fingers remain cool. If you reverse this arrangement-holding the top of the tube and heating the bottom of the tube-you will burn your fingers. The reason for this difference is that Conduction doesn?t function when the hot object is above the cold object. Radiation doesn?t function when the hot object is above the cold object. Convection doesn?t function when the hot object is above the cold object. Heat flows naturally from a hot object to a cold object, not the reverse. 2. The circulation of air to heat a room in an example of Radiation B. Transmission C. Convection D. Conduction 3. Some satellites orbit the earth at such large distances that they are never in the earth?s shadow. These satellites are constantly exposed to full sunlight. With no air around them to take away heat, why don?t these satellites continue to grow hotter forever? Their temperatures rise until they are able to radiate heat away into space as fast as it arrives from the sun. They use air conditioners (which NASA calls ?thermal stabilization units?) to eliminate the excess thermal energy as rapidly as it arrives. Because they are isolated from the sun by empty space, the sun?s heat can?t reach them and they don?t experience any changes in temperature. They have solar panels that convert the sun?s thermal radiation completely into electricity and avoid any need to eliminate heat. 4. I have a glass of Pepsi over ice sitting on the counter. It has been sitting there for fifteen minutes and still has ice in it. If the room temperature is 270 Celsius, what is the temperature of the Pepsi in the glass? A. 00 Celsius B. 290 Celsius C. 13.50 Celsius D. 270 Celsius 5. You can boil water at a temperature less than 100 deg. Celsius by Heating the water in an opened container at the top of a high mountain where the pressure is less than 760 mm Hg. Heating the water in a hermetically sealed container such as a ?pressure cooker? where the pressure in higher than 760 mm Hg. Heating the water in an opened container at sea level on a day with atmospheric pressure is about 760 mm Hg. None of these ways, it has to be 100 deg. Celsius or higher regardless of pressure. 6. In order to melt ice to water more fast, you A. Add heat and increase pressure on ice. Add heat and reduce pressure on ice. Remove heat and increase pressure on ice. Remove heat and reduce pressure on ice. 7. One way to keep the contents of a garage from becoming too cold on a night when a severe subfreezing temperature is forecast is to put a tub of water in the garage. If its initial temperature is 40 0C, what is the lowest possible temperature of the water and its surroundings until that happens? A. -273 0C B. 0 0C C. 40 0C D. 100 0C 8. A metal lid on a brand new glass jar of jam will not unscrew no matter how hard I twist the lid in the proper direction. To unscrew it with moderate ease, the best solution is to Put it in the oven at 90 deg. Celsius for a few minutes. Put the lid under warm water for a few minutes, but don?t let too much water hit the bottle. Put it in the refrigerator for a few minutes. Put the lid under cold water for a few minutes, but don?t let too much water hit the bottle. The present story begins on a bitter cold afternoon when a small commercial airliner develops engine trouble and has to ditch in a remote wilderness area near your base camp. You and a mountain rescue crew set out across the frozen landscape and reach the crumpled plane shortly before sunset. The ambient temperature at the rescue site is -30 0C. None of the passengers is seriously injured, but all are extremely cold and, with no hope of evacuating them until morning, your priority for the night is to keep everyone warm. 9. While you were gathering logs for a fire, your colleagues were trying to keep the airplane passengers from losing heat to their surroundings. Why was it important to keep the passengers from touching their surroundings? To avoid heat transfer to the colder object by conduction. To avoid heat transfer to the colder object by convection. To avoid heat transfer to the colder object by radiation. 10. With the fire blazing in front of them, the passengers begin to feel warm. Of course, no one wants to actually touch the hot coals or hover directly over the fire in the smoke, so they settle for sitting around the fire at a reasonable distance. What is conveying heat from the fire to the passengers? Conduction heat transfer Convection heat transfer Radiation heat transfer I'm doing this for fun!

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is it possible that ozone can naturally be occurring in a room?
recently, at certain times I can smell ozone in my bedroom, just for a few second. I don't have air purifier, ozonizer or ionizer. I live in tropical climate and I open my window when it's hot in the room, rarely use air conditioner. (the smell only occur when the all windows are closed). It really puzzled me from where the ozone smell possibly comes from.

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