Hey kiddo!
Have you ever heard someone talking from the next room or outside? When you can hear them, it means that sound is traveling through something, like a wall, to get to your ears.
Now, imagine that you want to make sure that the sounds of someone talking in a room don't travel too much to the other rooms around it. If you're building a house or a building, you want to make sure that the people in one room can't hear the people in another room too much.
This is where Sound Transmission Class (STC) comes in. It's a way to measure how much sound is able to travel through something, like a wall or a door. The higher the STC number, the less sound can travel through.
Think about it like a coat. A really thick coat is going to keep you warm in the winter because it keeps the cold air out, right? Well, a wall with a high STC number is like a thick coat- it keeps sound from traveling through it.
So, if you want to make sure that a room is really quiet, you need to make sure the walls and doors have a high STC number. But, if you want to make sure that a room has good sound quality, like if you're recording music, then you might want walls with a lower STC number, so sound can travel between rooms.
Was that helpful, kiddo?