Units link

I'm just going to put this here because it's useful.

Imperial (hamburger land) Metric (better)
1 inch 2.54 cm
1 foot 0.3048 m
1 mile 1.60934 km
1 pound 0.453592 kg
1 ton (imperial) 1016.05 kg
1 acre 4046.86 km²

Constants link

I don't know how many constants there will be, but I assume there will be enough to require a section.

Constant Imperial (hamburger land) Metric (better)
Gravity $$-32 {\text{ft} \over \text{sec}^2}$$ $$-9.8 {\text{m} \over \text{sec}^2}$$

Significant figures link

I actually don't really understand these very well so I don't think I'm qualified to write about it. please help me. i don't understand significant figures.