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1000 Science Fair Projects with Complete Instructions

34 Water Experiments

34 Water Experiments

Get ready to dive into some exciting water projects that will help you understand how incredible water is! Explore how water plays a vital role in plants, discover the special properties that make water unique and do fun chemical reactions with water! Dive in and discover the fascinating world of water!

Browse Water Experiments

Check out all the different water projects with complete instructions and videos. They're great for students' science fair projects and a fun way for kids to learn about the science of water!

Ice Wedging and Rock Breakdown
1. Ice Wedging and Rock Breakdown
Freeze water inside plaster of Paris and watch ice wedging crack it apart, just like real rocks in winter.
Medium
Frozen Ice Cube Lava Lamp
2. Frozen Ice Cube Lava Lamp
Drop colored ice cubes into oil and watch streams of melting color swirl downward like a slow-motion lava lamp.
Easy
Salt, Heat, and Surface Tension Strength
3. Salt, Heat, and Surface Tension Strength
Drop rice grains onto foil floating in pure and salt water at five temperatures to map how surface tension weakens.
Medium
Water Temperature and Convection
4. Water Temperature and Convection
Drop food coloring into three jars of different temperature water and watch the color spread at wildly different speeds.
Medium
Salt, Sugar, and Freezing Point Depression
5. Salt, Sugar, and Freezing Point Depression
Freeze eight salt and sugar solutions side by side and discover why cities choose salt over sugar for icy roads.
Medium
Leaf Size and Water Loss in Plants
6. Leaf Size and Water Loss in Plants
Place three plants with very different leaf sizes in water for five days and find out which one drinks the most.
Medium
Pre-Soaked Spaghetti and Cooking Time
7. Pre-Soaked Spaghetti and Cooking Time
Soak spaghetti in water for a few hours, then boil it for just one minute to test whether pre-soaking cuts cooking time.
Medium
Temperature, Acidity, and Tablet Dissolving Speed
8. Temperature, Acidity, and Tablet Dissolving Speed
Drop Alka-Seltzer tablets into water and acid at four temperatures and time how fast each one dissolves.
Medium
Gatorade vs. Water and Pulse Rate
9. Gatorade vs. Water and Pulse Rate
Have the same subjects exercise after drinking Gatorade one day and water another, then compare their pulse rates to see if electrolytes matter.
Medium
Lake Pollution at Different Depths
10. Lake Pollution at Different Depths
Collect lake water at four depths and test for acidity, cloudiness, ammonia, and nitrates to map how pollution changes below the surface.
Hard
Water Temperature and Simulated Tornado Size
11. Water Temperature and Simulated Tornado Size
Build a tornado chamber with dry ice and an exhaust fan, then change the water temperature to see which setting creates the widest vortex.
Hard
Electrolysis with Pencils and Salt Water
12. Electrolysis with Pencils and Salt Water
Connect a 9-volt battery to two pencils in salt water and watch hydrogen and chlorine bubbles form at each tip.
Medium
Cold Water and Vocal Range
13. Cold Water and Vocal Range
Test five singers before and after drinking ice water to discover whether cold temperatures shrink their vocal range.
Medium
Chemical Energy in a Peanut
14. Chemical Energy in a Peanut
Burn a single peanut under a can of water and measure how many degrees the temperature rises.
Medium
Air Pressure and the Collapsing Can
15. Air Pressure and the Collapsing Can
Boil water inside an empty soda can and flip it into ice water to watch outside air pressure crush the can in an instant.
Medium
Aluminum Foil, Paper Towels, and Ice Melt Rate
16. Aluminum Foil, Paper Towels, and Ice Melt Rate
Wrap ice in aluminum foil versus kitchen towels and track which covering keeps it frozen the longest.
Easy
Bacteria in Water Coolers vs. Tap Water
17. Bacteria in Water Coolers vs. Tap Water
Swab water from a cooler and a tap into petri dishes and discover which source grows more bacteria.
Medium
Boiling Point and Altitude
18. Boiling Point and Altitude
Change four conditions one at a time and discover which single factor shifts water's boiling point.
Hard
Radish Growth and Daily Water Volume
19. Radish Growth and Daily Water Volume
Give ten pots of radish seeds different daily water amounts and find the range that produces the tallest plants in ten days.
Medium
Microscopic Life in Pond Water
20. Microscopic Life in Pond Water
Place a single drop of pond water under a microscope and discover the hidden world of protists and microorganisms living inside it.
Medium
Surface Tension and Water Strider Design
21. Surface Tension and Water Strider Design
Design a model insect from simple materials and see if you can make it stand on water using surface tension.
Medium
Thermal Insulation: Three Materials Compared
22. Thermal Insulation: Three Materials Compared
Pack flasks of boiling water in three different insulating materials and track which one holds heat the longest.
Medium
Animal Pens and Well Water Contamination
23. Animal Pens and Well Water Contamination
Test well water near animal pens and away from them to find out which samples carry fecal bacteria like E. coli.
Hard
Household Insulation vs. a Thermos
24. Household Insulation vs. a Thermos
Wrap jars in different household materials and race them against a thermos to find the best insulator.
Medium
Rain-X vs. Aquapel Water Repellency
25. Rain-X vs. Aquapel Water Repellency
Coat two glass sheets with competing water repellents and time which one lets a drop slide faster.
Medium
Sugar Concentration and Water Viscosity
26. Sugar Concentration and Water Viscosity
Drill a hole in a metal cup and time how long sugar-water solutions of increasing strength take to drain through it.
Medium
Bottle Opacity and Solar Water Disinfection
27. Bottle Opacity and Solar Water Disinfection
Scratch plastic bottles to different levels of cloudiness and discover how much sunlight needs to pass through to kill bacteria in the water.
Hard
Buffer Capacity of Three Local Water Sources
28. Buffer Capacity of Three Local Water Sources
Add a drop of acid to water from three local sources and see which one resists pH change the most.
Medium
Rural Creek vs. Urban Creek: Water Quality Compared
29. Rural Creek vs. Urban Creek: Water Quality Compared
Collect water from a rural creek and an urban creek fed by the same snowpack and compare their chemical levels.
Medium
Acid Rain's Effects on Soil, Stone, and Living Things
30. Acid Rain's Effects on Soil, Stone, and Living Things
Soak limestone, leaves, and fish in acid solution and plain water side by side to see what acid rain does to natural materials.
Hard
Wetland Pollution and Hidden Contaminants
31. Wetland Pollution and Hidden Contaminants
Survey a wetland for visible pollution, then taste-test clear liquids to prove that clean-looking water can hide harmful substances.
Medium
Lead Pipes and Tap Water Contamination
32. Lead Pipes and Tap Water Contamination
Collect tap water from five old houses with lead pipes and five new houses with PVC, then send all ten samples to a lab for lead testing.
Hard
Water Filtration with Charcoal, Sand, and Gravel
33. Water Filtration with Charcoal, Sand, and Gravel
Build a layered filter from charcoal, sand, and gravel and watch murky water come out clear on the other side.
Medium
Water Purification: Three Methods Compared
34. Water Purification: Three Methods Compared
Run tap and river water through three purification methods and test which one removes the most contaminants and kills E. coli.
Hard

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