what is diffusion and osmosis daily life examples of diffusion and osmosis and i will clear all the misconceptions regarding diffusion and osmosis firstly let me teach you that what is diffusion well consider region x in region y in region x there are 10 molecules of oxygen gas are present while in region y there are two molecules of oxygen gas are present we say that region x has high concentration of oxygen gas because it has 10 molecules of oxygen gas comparatively we say that region y has lower concentration of oxygen gas because it has two molecules of oxygen gas as a natural process molecules of oxygen gas moves from region x to region y let me repeat it molecules of oxygen gas move from region x to region y let me ask you how many molecules should move from region x to region y well the answer is simple only 4 molecules will move from region x to region y here 6 molecules of oxygen gas are present in region x and 6 molecules of oxygen gas are also present in region-wide so the net movement of molecules well stop therefore we define diffusion as when molecules move from high concentration region to lower concentration region this process is called diffusion let me repeat it when molecules move from high concentration region to lower concentration region this process is called diffusion now in both the regions there are same numbers of oxygen molecules are present so they also have the same concentration we say that same concentration between two region means no diffusion let me repeat it same concentration between two region means no diffusion also remember that diffusion only occurs in gases and liquids no diffusion process occurs in solids if you ask me why molecules move from region x to region y then the answer is simple we say that diffusion is a natural process in which molecules move from higher concentration region to lower concentration region thus noted down all these important points now let me teach you two bonus questions does diffusion require any energy to take place the answer is no it doesn't need any external energy it is a natural process and it is also a slow process so no external energy is needed for diffusion secondly is the moment of wind is diffusion the answer is no it is not a diffusion we know that moving air is caused by the differences in air pressure so the moment of wind is caused by differences in air pressure it is not a diffusion process remember that diffusion purely depends on concentration differences between two regions now let me teach you some examples of diffusion in our daily life the first example of diffusion is the smell of perfumes we know that the smell of perfume spreads due to the diffusion secondly the up movement of helium balloons it is because the helium is gradually diffusing from a helium rich region to the helium poor region thirdly when we open the soda cold ranks we can see that the carbon dioxide gas diffuses in the air fourthly when we add sugar in a cup of hottie it slowly dissolves in the tea it is also an example of diffusion lastly let me clear one misconception about diffusion a lot of people think that breathing like inhalation and exhalation is a diffusion but it is totally wrong it is not a diffusion process the inhalation and exhalation process is caused by pressure difference not by the diffusion now coming to the second part of this lecture what is osmosis well personally i say that osmosis is the special type of diffusion which only occur in water we can say that osmosis is the diffusion of water molecules now to learn osmosis we must learn that what is semi-permeable membrane well semi-permeable membrane only allows water molecules to pass through it doesn't allow big molecules like sugar molecules are solved secondly you should also understand dilute solution and concentrated solution and dilute solution there are more water molecules present while in concentrated solution comparatively there are less water molecules are present now consider case number one let this is the semi-permeable membrane which divide the system into two parts let in this part of the system there are nine molecules of water are present while in this part there are also nine molecules of water are present if i ask you what about the net movement of water the answer is simple they both have the same molecules of water so they have the same concentration thus the net movement of water will be zero i mean water will not move from one part to the another part now let's consider case number two let in this part of the system there is concentrated salt solution while in this part of the system there is dilute salt solution these two parts of the systems are divided by the semi-permeable membrane let in concentrated salt solution there are four water molecules present while in dilute salt solution there are 12 molecules of water are present here we are only interested in the movement of water molecules let me repeat it we are only interested in the movement of water molecules let me ask you can you guess the moment of water molecule well in the dilute solution greater number of water molecules means greater concentration of water molecules while here in concentrated solution smaller number of water molecules means smaller concentration of water molecules we know that water molecules move from higher concentration region to lower concentration region so water molecules will move from dilute solution towards concentrated solution know how many molecules will move from dilute solution towards concentrated solution well only 4 molecules of water will move from dilute solution towards concentrated solution now in concentrated solution there are 8 molecules of water are present while in dilute solution there are also 8 molecules of water are present so no more net movement of water molecules will take place because both the solutions have the same number of water molecules and osmosis would stop therefore we define osmosis as the moment of water molecules from a solution with a high concentration of water molecules to a solution with a lower concentration of water molecules let me repeat it the moment of water molecules from a solution with a high concentration of water molecules to a solution with a lower concentration of water molecules just noted down all these important points now let me teach you some daily life examples of osmosis the first example of osmosis is fish absorb water through skin and gills the second example of osmosis is plants plants absorb water from the soil through root hairs the third example of osmosis is potato placed in water potato absorbs water through osmosis the fourth example of osmosis is digested food absorbed in small and large intestine so we also absorb digested food through osmosis thus these are the different examples of osmosis