ELI5: Explain Like I'm 5

History of weights and measures

Weights and measures are types of measurements that help us to measure the size, weight, and amount of things. People have been using them to help them figure out how much of something they need to buy or sell since ancient times. For example, if someone wanted to buy a bag of apples at the store, they could use a scale to measure how heavy the bag was and how many apples were inside the bag. In order to buy and sell things fairly, the same measurements were used in different places. Over time, governments around the world have debated and agreed on standard weights and measures that everyone in the country would use. This helps to make sure that everyone can buy and sell things in a fair way.