Because gas molecules continually collide with others. The result is a random path (known mathematically as a drunkard's walk) which results in a very long time to cover a significant distance.
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Gas diffusion in air takes time because gas particles move randomly and collide with each other and with the molecules of the surrounding air. During these collisions, the gas particles transfer momentum and energy to each other, leading to a gradual mixing of the gases. This process can be influenced by factors such as temperature, pressure, and concentration gradients.
Gas spreads around a room because ags is made of different particles which like to be very spread out. Because of this gases then diffuse (spread out). Gases can then also be compressed into samller sizes.
Diffusion takes place by means of random thermal motion of molecules. Since the molecules move at a finite speed, diffusion takes time.
It will take helium gas (He) less time to diffuse than sulfur dioxide gas (SO2) due to its lower molecular weight. Diffusion rate is inversely proportional to the square root of molecular weight, so helium will diffuse faster than sulfur dioxide. Therefore, helium will likely diffuse from the container in less than 20 seconds.
Chlorine gas will diffuse faster than bromine gas because it has a lower molecular weight and therefore moves more quickly through a medium. The rate of diffusion is inversely proportional to the square root of the molar mass of the gas, so lighter gases diffuse faster.
If gas is not in a container, it will expand to fill the space available to it. The gas particles will spread out in all directions until they encounter a barrier or become so diffuse that they merge with the surrounding air.
Hydrogen gas is the lightest element, which means it has the smallest molecular size and mass. This leads to it having higher average velocity at a given temperature compared to other gases, allowing it to diffuse more rapidly. Additionally, hydrogen gas molecules have weaker intermolecular forces, which further promotes faster diffusion.
Nitrogen gas will diffuse the fastest because gases diffuse more rapidly than liquids or solids due to their higher molecular speeds and lack of intermolecular forces that impede diffusion. Honey and sugar are viscous liquids and will diffuse more slowly due to their higher molecular weight and stronger intermolecular forces.