Atoms, Moles and Stoichiometry: The Mathematics of Science and The Art of Science.

Wow. After I've read the article on the mathematics behind science, I finally realised the importance of SI units. By looking at the first table on page 1, I wondered how people of different nations would be able to trade with one another with different kinds of measurements. Surely it would be very confusing, but I am also curious what Singapore's system of units will be, seeing that the people are from different races?

Of course, I've already knew that there's only 7 base SI units from my physics lesson, but there's still an itchy question on my mind: how luminous intensity is measured? (Under candela.) And it's my first time I've ever heard of an unit called 'bar'.

Prefixes is something I'm supposed to know since I studied physics, though I would like to just add on one more line: pico, symbol p, factor 10^-12.

Regarding the example under the section on The Art of Science, I don't really like the working shown. Yes, I know I should throw away my what-I-was-being-taught-in-secondary-school mindset, but I felt that the method I've learnt in secondary school was a lot easier to understand, not to mention the working is clean and straight-forward. The method I was being taught in secondary school was to write the working in table form instead.