I am not good at natural science. Therefore, I cannot properly explain the necessity of the metric unit system for science in general.
I dare say that 1 cm3 = 1 cc(cubic centimeter) = 1 ml of water has 1 g of weight under normal air pressure.
The metric unit system seems convenient for integration or correlation of length, area, volume and weight of substance or of something.
In Japan, the metric unit system is widely used, not only for chemistry or physics.
For example, I say that my shoe size is 22.5 centimeters, price of 1 litter of gas has been increasing recently, the train runs at speed of 150 kilometers an hour , I'm 153 centimeters tall , I weigh 45 kilograms(?), and so on.
The metric unit system seems systematic and in Japan, we commonly use the system. Therefore, we tend to assume that the metric units should be internationally understood and accepted.
However, actually, in the US, people do not understand how tall 153 centimeters are. I had better say that I am 5 feet tall. Though "my" one foot length is 22.5 centimeters and I should be slightly shorter than 7 feet, if I use my foot size to measure my height .
1 foot(feet) = 30.48 centimeters, 1 foot=12 inches: decimal+2 base .
Anglo-American(?) people must be good at calculation.
It is quite important for Japanese to use an individual weights and measures unit system of each country to convey clear-cut size of objects to our counterparts.
If possible, for international communication, I wish for them to use the metric unit system. Conversion from centimeters to feet and inches is really cumbersome.
