When we mean (one liter), we just say it. But what about other numbers?
1.5 liter/1.5 liters?
Hi Matilda. In BE it is litre/litres but there may be a different usage for other native English speakers. You may see examples such as 2 litre bottle or 1.5 litre can, but of course the singular is used because you are talking about the container. If you are only using 1.5 or 2 then you use litres.