Talking Gas #1: What is gas?

The name of the gas comes from the synthesis of the word mixture, which briefly summarizes the main properties of the simplest state of matter. A gas is a cloud of randomly moving and chaotic particles, constantly colliding with each other and the walls of any container. The true volume of the components is eded with the total area it occupies, and this is why the gas fills in any allowable volume and is easily compressed. The average speed of gas molecules is hundreds of meters per second, and it is collided with each other billions of times per second. This is why the gases mix quickly and why it puts pressure on.

The easy-to-line motion constant is demonstrated by flushing an unpleasant amount of odorous gas into a room. Within seconds the gas can be smelled in all parts of the room. These properties apply to substances that are normal gases and types of vapors that are evaporated from liquids.

A volume of any gas at the same temperature and pressure contains the same number of molecules regardless of what gas it is. This means that it is very convenient to measure gas detectors by volume. Gas detectors at a higher level are in units % (volume) and lower than the level of million, ppm (volume).

While different gases have different proportions, they do not completely separate into layers according to their proportions. Heavy gases tend to sink and light gases tend to rise, but they move constantly which means constant mixing together (i.e. they are not like liquids).

So, in a room where methane leaks, gas will tend to emerge because it is lighter than air, but since constant movement means there will be a significant concentration at the floor level. This will happen in perfect conditions but if there is any air flow, the mix will be increased.

Rae system multi-target toxic gas detection detector
Rae system multi-target toxic gas detection detector

Air is a mixture of gases, usually:

  • Nitrogen 77.2%
  • Oxygen 20.9%
  • Steam 0.9%
  • Argon 0.9%
  • Carbon Dioxide 0.03%
  • Other Gases 0.07%

Since its composition is constant, air is often considered a single gas to simplify the measurement of toxic gases and the measurement of flammable gases for applications with domestic gas detection devices safely and healthily.


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