 I have some salt on the spoon, this hammer and this small camphor tablet. I'll take this piece of paper, place all this salt on it, add the camphor tablet and crush all of them together just like this. Okay, so we see, we see a white powder now. Now if I ask you to separate the camphor from the salt, will you be able to do so? Well, it will be really difficult, right? This camphor is white and it's been completely crushed, salt is also white. So how do we separate? How do we separate one solid that is camphor from another solid that is salt? Well, for this, we'll try and heat up this mixture. So to start with, we will switch off the flame and keep a steel plate on top of this, on top of this steel grid. And then on top of the plate, I will place the mixture and on top of that I will keep a glass. I will put a glass and keep it. So let's see what happens. Well, we are seeing this white smoke inside the glass, right? Turns out these are the vapors of camphor. Camphor directly changes from solid to gas and that process is called sublimation. So we started off with camphor and salt in the solid state. Now we have camphor, some of the camphor in its vapor state and salt is still solid. So now if we take away the glass, we would have to be very careful here. We can let the glass cool for some time. And when we do that, notice what happens. We see this white substance being deposited on the walls of the glass, right? What is that? Well, that's camphor. Camphor vaporized and once the glass was allowed to cool, the camphor turned back into solid state and we can see camphor being deposited on the walls. Let's have a look at this. This is camphor. If we look at the plate again, we will see the salt present and there will be some camphor as well because we did not let all the camphor change to vapor. So from the process of sublimation, we were able to separate camphor from salt, a mixture of camphor and salt. Camphor turned directly from solid to vapor that's called sublimation and once it came into contact with the walls of the glass and the walls of the glass were given some time to cool, camphor changed back to solid form. This process of gas directly changing to solid upon cooling is called deposition. Now you must have used naphthalene balls, right? Naphthalene balls are used between clothes to repel moths and other insects that can damage fabrics. And naphthalene balls, they directly turned to gas just like camphor and when they do change to gas, that gaseous form of naphthalene is toxic to insects and this gas spreads throughout the surrounding area creating like a protective barrier around the clothes.