Tap off. Teeth on.
You will discuss a tap-off routine without adding brushing substances to this activity. Water saved depends on flow and how long the tap would otherwise run, so a bucket-sized claim needs measurement.
- Planet
- Starter
- About 15 minutes
Help needed: yes for supervising observation and checking local or factual guidance
The film shows brushing with the tap off. This page is a talk-and-observe version, so follow the page and keep to your usual brushing routine.
What you need
- Paper
- A pencil
- A helper
- An ordinary tap observed from a safe position
The rule
The tap stays off while you brush.
How to do it
- Ask someone to explain the household’s usual tap-off routine.
- Observe the tap without running water for the experiment.
- Draw a timeline with the tap-on moments marked.
- Mark the interval where running water is unnecessary.
- Compare that plan with leaving the tap on throughout.
- Ask the helper to manage any real routine separately.
Why it works
A running tap delivers water at a flow rate, measured as a volume per unit of time. Avoiding an unnecessary running interval avoids the water that would have flowed during it. The amount equals flow rate multiplied by that interval if the rate stays constant. Different taps and settings have different rates, so the film’s bucket comparison is not a universal measured result. A timeline shows the reasoning without deliberately wasting water or adding a chemical home experiment.
Make it harder
- Compare two hypothetical running intervals.
- Explain how changing the flow rate changes the avoided volume.
- Write the units needed for a valid flow-times-time calculation.
Ask Taz
- Why does turning the tap off avoid water use?
- Why does the amount depend on flow rate?
- Why is a timeline enough to explore the idea?
Before you start
This observation page adapts the source brushing challenge to avoid introducing substances or altering personal-care guidance. Keep any ordinary brushing routine under the helper’s usual guidance. Do not run water just to demonstrate waste or reach awkward controls. Ask at dinner: “What would we need to measure before claiming a particular number of litres avoided?”
Taz is an AI and can be wrong, so check what matters. Read how safety works on Taz.
Show us yours
Film your hands and what you made, not your face or name. If you are under 18, ask a parent or guardian before posting anywhere else.
Common questions
Does the original film rule still apply?
The rule is reproduced above exactly. Where handling, substances or local conditions make the filmed activity unsuitable, this page gives an observation or planning adaptation and says so. Do not claim that an adapted attempt completed a different physical action or proved a wider environmental result.
What should I check first?
Check the setting, the proposed materials and any local guidance named in the steps. Keep unknown waste, sharp items and private details out of the activity. Discuss uncertainty openly and leave an unconfirmed claim unresolved rather than forcing a confident answer.
Is online sharing required?
No. A conversation at home is enough. Any optional post follows the privacy line above.
More to try
See all Taz Challenges, or look through the science labs. One place for every why. Start exploring at aitaz.com