Damage to the South Polar ozone hole of 27 million square kilometers, larger than North America which covers about 25 million square kilometers.
In our daily life, it is rather difficult to say that something is long, tall, wide. Measurements give the exact dimensions of objects and substances. The first measurements were based on the human body. The Romans counted the number of times their right feet went forward. A cloth merchant measured his goods by stretching them from his nose to his fingertips.
An easy guide to convert mm to m and m to mm.