Rise over thermal
Okay kiddo, so you know how sometimes when you heat something up, like soup or water, it starts to bubble and rise up to the top of the pot? That's called "rise over thermal!"
Basically, when you heat something up, the molecules inside it start moving around and spreading out. This makes the substance less dense (which means there are fewer molecules in the same amount of space). And when something is less dense than the liquid or gas around it, it wants to rise up above it!
So, for example, if you heat water in a pot on the stove, the water at the bottom of the pot starts to get warmer than the water at the top. This makes the water at the bottom less dense, so it starts rising up toward the top of the pot. As it gets closer to the top, the cooler water there starts to push it back down, creating a circular motion called convection.
In addition to soup and water, rise over thermal can happen in lots of other things too, like the air in your room when the heater is on, or even in the ocean (which is why you might see waves on the surface). So remember, when things get hot and start to rise, it's all because of rise over thermal!
Basically, when you heat something up, the molecules inside it start moving around and spreading out. This makes the substance less dense (which means there are fewer molecules in the same amount of space). And when something is less dense than the liquid or gas around it, it wants to rise up above it!
So, for example, if you heat water in a pot on the stove, the water at the bottom of the pot starts to get warmer than the water at the top. This makes the water at the bottom less dense, so it starts rising up toward the top of the pot. As it gets closer to the top, the cooler water there starts to push it back down, creating a circular motion called convection.
In addition to soup and water, rise over thermal can happen in lots of other things too, like the air in your room when the heater is on, or even in the ocean (which is why you might see waves on the surface). So remember, when things get hot and start to rise, it's all because of rise over thermal!