l>Aerosols and also pressure. Exactly how do gases behave? Pressure and also temperature.

You are watching: Why is it important not to puncture an aerosol can

*

*

What’s this?


You should never litter an aerosol have the right to onto a fire or leaving it in direct sunlight – also if it is empty. This is because the pressure will construct so up so much that the can will to explode (and explode if there is a naked fire nearby). There room two factors for the press going up:the gas pressure increasesmore that the liquefied propellant turns into a gas.Let"s look at at this in much more detail.Pressure from gasesPicture 4.4 once a gas is boil its particles move faster.

Absolute temperature

We speak to kelvin temperatures pure temperatures. At zero kelvin, all particles avoid moving; this is pure zero.

Ice melts at 0ºC. This is equivalent to 273K. To find out the temperature in kelvins, we need to add 273 to the celsius value. So the boiling allude of water is 100ºC or 373K (100 + 273).

Absolute temperature scale

1. Why walk gas press increase?The corpuscle in a gas are moving. Lock bump into the walls creating a pressure. When a gas is heated, its particles speed up. There are two ways that this increases the pressure:the faster particles bump right into the container walls much more ofteneach collision is harder due to the fact that the particles are relocating faster.Taking the furtherThe press of a gas increases if the temperature increases. We gain a more powerful relationship in between pressure and also temperature as long as we measure the temperature ~ above the absolute temperature scale (see box on the left).

In that case, the pressure is proportional come temperature. If we:

double the absolute temperature, the press will doubletriple the pure temperature, the push will triple

and so on.

2. An ext propellant turns into gas

The rise in gas push is not sufficient on its own to be dangerous. It would certainly take a large rise in temperature come have any noticeable effect on gas pressure. If you heat a gas indigenous 27ºC up to 127ºC, you could think the the temperature has gone increase by a factor of around 5. However, this is not the case. The absolute temperature has actually risen from 300K to 400K. Therefore the temperature has not also doubled - it has actually gone up by a third. As such the push will walk up by just a third. There have to be something else that causes the push to come to be dangerously high.

Even much more pressureAs well as the gas push increasing, pressure will additionally increase because much more of the liquefied propellant turns right into a gas. You have the right to see this at home when a saucepan the water starts to boil. The water transforms into steam and produce a large increase in push - sufficient to lift increase the saucepan lid.

Aerosols room tested before leaving the factory. The filled can is immersed in a water bath at 50ºC for several minutes. This boosts the press in the can, revealing any leaks and assuring that strength.

See more: Convert 16 Liters Is How Many Gallons (16 L To Gal), Convert Liters To Gallons

starttopunitspagesQuestion 10Look at the table below and fill in the gaps.ºCKPressure /atmosphere2726006-123


Summary Closeas the temperature of a resolved mass of gas increases, the push increasesWarning - do not shot heating aerosols at residence - the is extremely dangerous
because the corpuscle make more collisions and also each one is more forcefulpressure is proportional to pure temperaturethe absolute temperature scale is measure in kelvinsabsolute zero is -273ºC