1. What is the difference between mass and weight?
For mathematical purposes the mass and the weight are the same.
2. 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.
It is currently defined as the length of the path travelled by light in a vacuum for a time of 1/299 792 458 th of a second.
3. 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
4. What is a litre?
Think of a litre as a cube of side 10 cm. This gives an volume of 10 × 10 × 10 = 1000cm3
5. What is a tonne?
A tonne is a mass of 1000 kg
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