Hi there,
Short version: Why can the units g/L also be written as g L-1?
Long version:
During my chemistry A-level this was explained to me really clearly but frankly I've forgotten now. Now I've almost finished my degree and I've asked lots of people and nobody seems to be able to explain it.
Basically some units such as mol/litre, g/litre, or mEq/L can also be expressed as mol L-1, g L-1, and mEq L-1 respectively.
While I fully understand what they mean, and it doesn't impact my ability to work and interpret results (I'm qualifying as a nurse soon), I just don't understand where the ^-1 comes from, mathematically. I'm hoping someone methematically minded can explain this to me.
Thank you!