Physics · Fluid Mechanics
Build a hydraulic lift with syringes
Connect two syringes of different sizes and show how a small push lifts a large load.
- Easy
- 1 day
- Under 250
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Mechanical Engineering · Fluid Systems
Design a hydraulic arm from syringes
Build a three-joint arm moved by water-filled syringes that picks up and places an object.
- Easy
- 1–2 weeks
- 250–500
Chemistry · Electrochemistry
Build a lemon battery and compare fruits
Make cells from fruit, zinc and copper, measure their voltage and light an LED with several in series.
- Easy
- 1–3 hours
- Under 250
Environmental Science · Water
Build a rainwater harvesting model and size a real tank
Make a working roof-to-tank model and calculate how much rain your own roof could collect.
- Easy
- 2–7 days
- 250–500
Physics · Mechanics
Calibrate a spring and build a newton meter
Stretch a spring with known weights, plot the graph and turn it into a force meter you can use.
- Beginner
- 1–3 hours
- Under 250
Physics · Optics
Build a pinhole camera and find its magnification
Make a box camera with no lens and show that image size depends on object and screen distance.
- Beginner
- 1–3 hours
- Under 250
Robotics, IoT and Hardware · Arduino
Make a digital thermometer with a display
Read a temperature sensor and show the value on a small screen.
- Easy
- 2–7 days
- 500–1,000
Physics + Environmental Science
Build a solar oven and measure its efficiency
Make a box cooker from cardboard and foil and track how hot it gets compared with open air.
- Easy
- 1 day
- Under 250
Astronomy and Space · Planetary Science
Build a scale model of the solar system on your street
Shrink the solar system so the Sun is a football and place the planets at true scale distances.
- Beginner
- 1 day
- Under 250
Astronomy and Space · Observational Astronomy
Make a model of the solar and lunar eclipses
Use a torch and two balls to show how the Moon's shadow and the Earth's shadow cause eclipses.
- Beginner
- 1 day
- Under 250
History · Ancient History
Build a museum exhibit on an ancient civilisation
Make a model town, artefact replicas and labels that explain daily life in one ancient city.
- Easy
- 1–2 weeks
- 250–500
Physics · Optics
Build a periscope and test the law of reflection
Make a periscope from card and two mirrors and show that both must sit at 45 degrees.
- Beginner
- 1–3 hours
- Under 250
Environmental Science · Water
Build a solar still to purify water
Make drinking-quality water from salty water with sunlight and measure how much you get.
- Easy
- 1 day
- Under 250
Electronics and Communication · Sensors
Make a water-level indicator
Light LEDs at quarter, half and full tank and sound a buzzer when it is about to overflow.
- Easy
- 2–7 days
- Under 250
Biology · Human Physiology
Build a model of the lungs and measure lung capacity
Make a bell-jar lung model from a bottle and balloons, then measure real lung capacity by displacing water.
- Beginner
- 1–3 hours
- Under 250
Astronomy and Space · Rocketry
Build and launch a paper rocket with a stomp launcher
Launch paper rockets with compressed air and test how fins and nose shape change the distance.
- Easy
- 1 day
- Under 250
Physics · Electrostatics
Build an electroscope and test charges
Make a foil-leaf electroscope in a jar and use it to compare charged objects.
- Beginner
- 1–3 hours
- Under 250
Environmental Science · Water
Build a simple water filter and test it
Layer cotton, sand and gravel in a bottle and see how clear muddy water becomes.
- Beginner
- 1 day
- Under 250
Physics · Current Electricity
Build a simple circuit board game
Make a quiz board where a bulb lights when a question is matched to the right answer.
- Beginner
- 1 day
- Under 250
Earth Science · Physical Geography
Model a river and study erosion
Run water down a sand tray and see how slope, flow and plant cover change erosion.
- Easy
- 1 day
- Under 250
Chemistry + Environmental Science
Test how well different materials filter dirty water
Build layered filters from sand, gravel and charcoal and compare how clear the water comes out.
- Easy
- 1 day
- Under 250
Crops, Soil and Horticulture · Horticulture
Grow vegetables on a balcony or roof
Plan, plant and harvest a small container garden and record costs and yield.
- Easy
- 1–3 months
- 500–1,000
Earth Science · Meteorology
Build a rain gauge and keep a weather log
Make a rain gauge and thermometer station and record the weather daily for a month.
- Beginner
- 2–4 weeks
- Under 250
Earth Science · Hydrology
Make a model of the water cycle in a bag
Seal water in a clear bag on a sunny window and watch evaporation, condensation and "rain".
- Beginner
- 1 day
- Under 250
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