Originally Posted by daisy
Also - 1 teaspoon is 5g or 5ml.
This is true as a liquid measure, but you must remember that if you are measuring flour or something, it could be much less in weights.
That is why, in addition to metric measurements, I prefer going by weights rather than volume (like cup, spoon etc.) when you need to be exact about the amounts of ingredients. When I was less wise, I made a big mistake when I saw a cake recipe saying "200g of flour" and going on to use just 1 cup of it.