Was ist der Unterschied zwischen amount und quantity ?Du kannst auch einfach Beispielsätze geben.

There is no real difference - amount is a general term for defining time, volume or quantity, so it can be used for most things except length. Same for quantity.

eg. The amount of time he spent on the project was just crazy. A swimming pool contains a huge amount of water. Why does she need to buy such a large amount of books?

The quantity of time he spent on the project was just crazy. A swimming pool contains a huge quantity of water. Why does she need to buy such a large quantity of books?

However, there is a small difference: quantity is a more technical word (used in economics, finance and for mathematical/scientific terms), whereas amount is more general and used more in daily conversations.