SI units

SI units are a special way that scientists talk about measurements. Imagine you want to know how big your favorite toy car is. You could say it is 5 inches long, but another kid across the world might not know what an inch is!

So scientists use a special language called SI units. These units are like a secret code that every scientist around the world knows. It makes it easier for them to talk about measurements without getting mixed up.

In SI units, there are units for things like length (meter), weight (kilogram), and time (second). For example, instead of saying your toy car is 5 inches long, you could say it is 12.7 centimeters long in SI units.

SI units also make it easier for scientists to do math with measurements. For example, if a scientist wants to find out how fast a car is going, they use meters per second instead of miles per hour. This makes it easier to compare things and make sure everyone is talking about the same thing.

So, in short, SI units are a special language that scientists use to talk about measurements that makes it easier for them to understand each other and do math with measurements.