Chemistry · Inorganic Chemistry
Investigate what speeds up rusting
Leave iron nails in different conditions for a week and find what makes rust form fastest.
- DifficultyEasy
- Estimated time2–7 days
- BudgetUnder ₹250
- ClassClass 7–10
- TeamSolo or up to 2
- You needHousehold materials
Prerequisites: None
Original · by TechnifyedExperimentScience Fair ProjectBeginner friendlyLow costWell documented
Overview
Rusting needs both water and oxygen, and salt or acid speeds it up. Set up nails in dry air, boiled water under oil, tap water, salt water and vinegar, and compare them daily.
Why build this?
Rust costs the world billions every year; this simple setup shows exactly what causes it and how painting, oiling and galvanising stop it.
What you will learn
- That rusting needs both air and water
- How salt and acid speed up corrosion
- How barrier methods prevent rust
- How to run a fair test over several days
Skills you will use
Safety
- Wear safety glasses and gloves, work in a ventilated place, label every container and wash your hands afterwards. Do not taste or smell chemicals directly, and do not mix chemicals beyond the steps given.
- This project uses a blade or sharp tool. Cut away from your body on a cutting mat, and ask an adult to help younger students.
Materials and tools
- Eight identical iron nails
- Six clear jars or test tubes
- Salt, vinegar, cooking oil
- Boiled and cooled water
- Calcium chloride or dry rice as a drying agent
- Sandpaper
- Paint or nail polish
Step-by-step roadmap
Start
You will finish with: a week of photos, a rust-score graph and a ranked list of conditions with an explanation.
- 1
Prerequisites
Know this first: none. Then collect the 7 items in the materials list.
- 2
Learn
- That rusting needs both air and water
- How salt and acid speed up corrosion
- How barrier methods prevent rust
- How to run a fair test over several days
- 3
Plan
Write your question, your hypothesis and the one thing you will change. Draw the table you will fill in before you start.
- 4
Build
- Clean the nails with sandpaper so they all start bright.
- Set up jars: dry air with a drying agent, boiled water sealed with oil, tap water, salt water, vinegar solution.
- Add a painted nail and an oiled nail to tap water.
- Photograph every jar at the same time each day for seven days.
- Score the rust on each nail from 0 to 5 each day.
- Plot the rust score against days for each condition.
- 5
Test
The nail in dry air and the one under oil should show almost no rust; salt water should rust fastest.
- 6
Document
Record every reading with its unit, photograph the setup and draw a graph of the result. Report structure
- 7
Present
Explain the question, the method and the graph in two minutes; keep the setup ready to demonstrate. Presentation structure · Viva questions
- 8
Publish
Share the report and photos with your class, a science fair or your school magazine.
Expected outcome
A week of photos, a rust-score graph and a ranked list of conditions with an explanation.
Other versions of this project
Beginner version
Compare only three jars: dry, tap water and salt water.
Advanced version
Weigh each nail before and after (after removing loose rust) to measure the mass change.
Research version
Test how salt concentration (0 to 20 percent) changes the rusting rate and find whether the rate keeps rising.
Make this project better
- BasicCompare only three jars: dry, tap water and salt water.
- This projectInvestigate what speeds up rusting
- AdvancedWeigh each nail before and after (after removing loose rust) to measure the mass change.
- ResearchTest how salt concentration (0 to 20 percent) changes the rusting rate and find whether the rate keeps rising.
Ways to do this project
Text marked "You write this" is a prompt for your own work; everything else is specific to this project.
- Problem
- Which conditions make iron rust fastest?
- Hypothesis
- If iron is in contact with both water and air, and salt is present, then it will rust fastest.
- Variables
- Independent: the liquid and air around the nail. Dependent: rust score each day. Controlled: nail type, temperature, jar size
Materials and procedure are in Materials and the Roadmap.
Observation table
| Day | Dry air | Boiled water + oil | Tap water | Salt water | Vinegar | Painted |
|---|---|---|---|---|---|---|
- Graph
- Line graph of rust score against day, one line per condition
- Results
- You write thisState what the graph shows in one or two sentences, with numbers.
- Conclusion
- You write thisSay whether the result supports your hypothesis and why you think so.
Display board
- Title and your name
- Question
- Hypothesis
- Materials
- Procedure (with photos)
- Data table and graph
- Conclusion
- What you would do next
Questions judges ask
- What is rust chemically?
- Why does the nail under oil not rust?
- Why does salt speed up rusting?
- What would you change if you did this again?
- What was your biggest source of error, and how did you reduce it?
- Where is this idea used in real life?
- Research question
- Which conditions make iron rust fastest?
- Hypothesis
- If iron is in contact with both water and air, and salt is present, then it will rust fastest.
- Variables
- Independent: the liquid and air around the nail. Dependent: rust score each day. Controlled: nail type, temperature, jar size
- Methodology
- Test how salt concentration (0 to 20 percent) changes the rusting rate and find whether the rate keeps rising.
- Data collection
- You write thisSay what you will record, how many times, and how you will keep the records safe.
- Analysis
- Line graph of rust score against day, one line per condition
- Limitations
- You write thisList what could have affected the result: small sample, instrument limits, things you could not control.
Literature review
Find five to eight sources (your textbook, review articles, reports) and note what each says about your question. Group them by idea, not one after another, and end with what is still not known.
References
List every source you used in one style throughout (author, year, title, where it was published, link and the date you opened it).
Working as a team
Solo or up to 2. Suggested roles:
Report and presentation
Report structure
- Title and question
- Background: the science behind it
- Hypothesis
- Materials
- Method (steps, with a diagram or photo)
- Observations (table)
- Results (graph and calculation)
- Sources of error
- Conclusion
- What you would do next
- References
Presentation structure
- The question
- Why it matters
- The idea behind it
- Setup (photo)
- Method in three steps
- Results (one clear graph)
- What the result means
- Errors and limits
- Conclusion and next step
Viva questions
Try answering before you open each one.
What is rust chemically?
Hydrated iron(III) oxide.
Why does the nail under oil not rust?
The oil keeps dissolved oxygen out of the boiled water.
Why does salt speed up rusting?
Salt water conducts electricity better, which speeds the electrochemical reaction.
What is galvanising?
Coating iron with zinc, which corrodes in place of the iron.
Resources
Source and attribution
Original
Written by Technifyed. Free to use for your own school or college project; write the report in your own words. Added 1 Oct 2026.
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