How long does a shower have to be, to use the same amount of water as a bath?
Try 3 issues of BBC Science Focus Magazine for £5!
Many believe that showering uses less water than filling up a bathtub, but that all depends on how long you shower for!
Asked by: Lawrence Berry, by email
A bath filled about a third of the way up (which takes the water level over your belly button when you lie down) requires around 75 litres. An ordinary electrically heated shower puts out four litres per minute. So a 19-minute shower is just more than a bath. If you have a power shower, flow rates could be doubled and you’d need just 10 minutes.
Subscribe to BBC Focus magazine for fascinating new Q&As every month and follow @sciencefocusQA on Twitter for your daily dose of fun science facts.
May Half Price Sale
- Save up to 52% when you subscribe to BBC Science Focus Magazine.
- Risk - free offer! Cancel at any time when you subscribe via Direct Debit.
- FREE UK delivery.
- Stay up to date with the latest developments in the worlds of science and technology.