1. How heavy is a gram?
A gram is not much at all!
A teaspoon of medicine would weigh about 5 grams.
2. Who started the metric system?
The French introduced the metric system shortly after the French Revolution in the 1790s.
3. How far is a metre?
A metre was initially defined a one ten millionth of the distance from the equator to the North Pole on a line running through Paris.
4. Which are the most commonly used prefixes?
Kilo − 1000 times the base unit
centi- 1/100th of the basic unit
milli- 1/1000th of the base unit
5. What is a litre?
Think of a litre as the space occupied by a cube of side 10 cm.
6. What is a tonne?
A tonne is a mass of 1000 kg
7. What is the difference between mass and weight?
For mathematical purposes the mass and the weight are the same.