2007-01-21 11:53:38 · 4 answers · asked by Adriana 5 in Science & Mathematics ➔ Chemistry
for the gas in the can to expand and depressurize, it takes energy from its surroundings. That lowers the temperature of the nozzel where the gas expands.
2007-01-21 12:06:08 · answer #1 · answered by B H 3 · 1⤊ 0⤋
You'd think this stuff would be simply compressed air, wouldn't you? Sorry, but no. Neither is it the same as a fire extinguisher!
Most of the dust remover sprays are almost 100% DIFLUOROETHANE, regardless of brand. This gas is mildly flammable. There's other "ethanes" that are also used for this purpose, but I'll stick with just one toungue-twister here!
These gases are used because they compress much better than plain old air. Like C02, there's also some liquid in the can, which you can feel if you shake it. As the gas is released, this liquid becomes more gas. The liquid itself isn't supposed to come out. Here's the catch... It's not SUPPOSED to come out, but sometimes it does. If you spray long and hard, you release the gas faster than the compressed liquid can become gas. When that happens, some of the liquid begins sputtering out. The moment this liquid hits room-temperature air, it chills -Much the same as a C02 fire extinguisher (but don't try to put out a fire with this stuff!) and if you get more than a slight amount on your hands, it can cause frostbite. Further, the rapid conversion of liquid to gas inside the can causes rapid chilling of the can itself.
Recommended way to use this stuff is with quick, short bursts. A long, steady stream is going to waste the "air," and chill the can.
2007-01-21 20:31:28 · answer #2 · answered by BuddyL 5 · 0⤊ 1⤋
because essentially it's the same stuff in a fire extinguisher, don't hold it upside down and spray it because it can burn you....just spray a little bit at a time
2007-01-21 20:01:48 · answer #3 · answered by smcelvoy 2 · 0⤊ 1⤋
its simple.well because its cold.
2007-01-21 20:36:49 · answer #4 · answered by alli p 1 · 0⤊ 2⤋