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Aerosol Spray Cans
Start of Term Paper
Spray cans produce an aerosol, the technical term for a very fine spray.
They do this by means of a pressurized propellant, which is a liquid that boils
at everyday temperatures. Inside the can, a layer of gaseous pressure increased,
and eventu .... Middle of Term Paper
... can, but there is a
layer of free gas above the liquid. As the can empties liquefied gas vaporizes
to fill the space.
The valve is normal held shut by the pressure in the can, and by the
coil spring directly below the valve stem. When the push button is pressed, it
forces the valve stem down in its housing, uncovering a small a small hole which
leads up through the stem to the nozzle in the button. This allows the product
to be forced up the dip tube by the gas pressure in the can. The nozzle is
shaped to give a spray or a continuous stream.
To produce a fine mist, a propellant is used which mixes with the
product. The two leave the noz ... |
| Number of Words: 583 |
Approximate Pages: 3 |
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