It has come to my attention that many people are getting nervous becuase of numbers with lots of Os in them. Some thing like 1000000 grams looks a lot more than 1 ton. But if you do the maths then you will soon find that 1000000 grams is equal to one metric ton.
Also some units are smaller than others, my advice is to be careful of units. For example the grain is a very small unit of mass (circa 50 mg) so if someone tells you that they have a object which has a mass of 4 grains than it is only about 0.2 grams.
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