Mass flux

Mass flux is a way of measuring how much of some substance is flowing through a particular area. Think of it like a river - if you want to know how much water is flowing past a certain point in the river, you might measure the rate of it flowing by using a bucket to catch some water and then seeing how much water is filling the bucket every second.

Similarly, mass flux is a way of measuring how much of a particular substance (like air or water, or even something like salt or sugar) is flowing through a certain area, like a pipe or a membrane. We use mass flux to describe how quickly that substance is moving through that particular area. It’s like counting how many cars are driving down a road each hour.

We calculate mass flux by dividing the amount of the substance that passes through the area by the time it takes for it to pass through the area. So, if we want to know how much water is flowing through a particular pipe, we might measure how many gallons of water pass through the pipe every minute, and then divide that by how long it took to pass through. That would give us the mass flux of water through that particular pipe.

Overall, mass flux is just a way of measuring how much of a substance is moving through a particular area - it’s like counting how many things are going through a certain door each day!