Mass flow controller

A mass flow controller is like a special knob that helps control the flow of gas. Imagine you're playing with a water hose and you're trying to spray just the right amount of water onto a plant. If you turn the knob too hard, too much water will come out and the plant might get too much water. If you turn it too softly, not enough water will come out and the plant won't get enough water to grow.

A mass flow controller works in a similar way but with gas instead of water. It has a special sensor that can tell how much gas is flowing through it and it can adjust the gas flow to be just the right amount. It's like having a helper that makes sure the plant always gets just the right amount of water.

These controllers are often used in factories or labs where they need to control the amount of gas going into a machine or experiment. They're important because they make sure that everything is running smoothly and nothing gets too much or too little gas.

So, a mass flow controller is basically like a knob that helps control the gas flow, kind of like a water hose knob helps control water flow. It's important because it helps make sure everything gets just the right amount of gas.