 Hello everyone Today we are going to discuss about diffusion Diffusion is the simple process of movement of particles from its higher concentration to lower concentration See here all blue-colour particles are moving from its higher concentration to lower concentration, right? You know what diffusion happens in all states of matter like in gases in liquids Insolids let's discuss diffusion in gases in gases diffusion process is very fast Because particle move very quickly right Let's discuss one very common example smell of food being cooked in kitchen reaches to us if we are If you are sitting nearby area in the nearby area So what will be the process or what is the process over there? See all gas particles are moving from its higher concentration to surrounding area Let's discuss another example fragrance of burning incense stick Spritz all around right Another one is fragrance of perfume sprays. So all these are very common examples of diffusion in gases Next we'll see diffusion in liquids Diffusion in liquids is slower than gases There isn't spelling mistake. So diffusion in liquids is slower than gases because particle moves very slowly As compared to gases. What is the basic reason behind that? In the gas particles attraction forces are very less so they can move freely they can move faster Where in gas particles but in liquid particles attraction forces are more in between two particles, so They moves slowly Okay Here we'll see some examples of diffusion of liquids in liquid First is honey in water. I Have done one experiment in the class. I'll show you experiment here also Another example is diffusion of ink in water or we can say another example diffusion of food colorant in water Right, so one important thing about diffusion and liquids. We have two kind of liquids More thicker and less thicker. I can say more denser or less denser also What does it mean more thicker that means the density of liquid is high like I should say honey and less thicker that means alcohol acetone or Ink anything you can say right, so honey Will diffuse slower as compared to less thicker liquids What is the basic reason? Because in more denser liquids, they have high attraction forces or they have high number of molecules That is why they have high attraction forces and in less thicker less denser liquids They have less number of molecules or less attraction forces Next rate of diffusion is much faster than solids So rate of diffusion in liquids is much faster than solid obviously because in solids Particles are very closely attached to each other So they cannot move freely And in liquids particles are little far from each other. They can move freely Right now, let's talk about diffusion in solids Insolid diffusion is very very slow process Because particle moves very slowly Earlier I was thinking that diffusion doesn't happen in solid Because we don't see we cannot see the movement of particles in solid, right? But no what happens actually diffusion happens in solid and then the basic reason behind a slow diffusion is what? Suppose we have a wooden material here, so you can see that the Particles are very closely attached to each other. So you will not be able to see any movement of particles from one place to another place, right? So movement of particle is very less so diffusion is less but To see diffusion of solids what we can do we can just do one experiment if we have two metal blocks and We are bounding it together for few years Few years, okay after that we can see Some particles of one metal Are found to have diffusion another metal Okay, because they move very slowly so diffusion is very slow process That is why we can see our result in few years, okay? Now Questions so the first question is then potassium per magnet is placed in water Then potassium per magnet KMN of food is placed in water beaker then water of whole beaker turns to purple by its own What could be the reason Think think Potassium perm magnet is purple in color, okay? next question Explain how smell of food being cooked reaches to us from kitchen Another question is Honey is more viscous than water white So all these questions you have to prepare and you have to answer me in the class Children, goodbye. Take care