World is full of examples, where things have be going smoothly because of units. For that reason, all calculations should be done with units is SI-system, which notifies basic units. Unfortunately, not all countries use SI-system.[br][br][color=#0000ff]If you are not familiar with SI-system, use time to learn it. It is required in your engineering studies here in Finland.[/color][br]

Many units in use are derivatives from SI-units.[br]