Gas - what is it?
word "gas" is derived from the Greek word chaos, which means "chaos".Gas - a certain number of molecules that move randomly, colliding with each other and other objects.Then again, the molecule continues its movement.The distance between them is always much greater than their size.
movement of molecules in the gas phase takes place at very high speeds.Consequently, they are easily spread and mixed in any atmosphere.
now possible to allocate a total of three main types of gas - natural gas, water and coal.All of these species present common characteristics.For example, all three gases have the ability to contract and expand.The range is mu
ch broader than that of liquids and solids.
When placing the gaseous substance in any capacity, it spreads throughout the space evenly distributed in the container molecules.This phenomenon can be observed in lighters, gas cylinders, freezers and other items.Under the influence of temperature gas has the ability to shrink or expand.It does not have a gas volume.This applies to all three types of emissions.
gas density may be the same as that of the air, and may vary from greater to lesser.Air is the same - it is a mixture of gases which in most large quantities can be isolated nitrogen, oxygen and carbon dioxide.Some gases may be hazardous, since they can not see or touch.But sometimes you can feel the effect of the gas on the human body.For example, the effect of oxygen or carbon dioxide.If only breathe oxygen for a long time, there is a risk of getting food poisoning.
the vessel wall gas presses the same, regardless of the direction.However, such a proposition is true only from the point of view of the macrocosm substances usual for our lives.If you take, for example, a car tire, the gas pressure in it will be virtually identical, differing altogether in small numbers.But to drive such a small variation of the gas pressure does not affect the process.This can be compared with cutting of paper sheets several identical.In a few hundredths of a millimeter of their size will still vary.However, for solving the problem is not critical.
In the microcosm of atoms and molecules, the picture is completely different.There is no uniform distribution of pressure.In the tire gas expands, putting pressure on its walls.The molecules hitting the tire wall, bounce and continue their random motion.Such bumps are irregular, thereby changing the pressure inside the tire.