Physics + Environmental Science
Model the greenhouse effect in two bottles
Compare how fast air and carbon-dioxide-rich air warm under the same lamp.
- DifficultyEasy
- Estimated time1 day
- BudgetUnder ₹250
- ClassClass 7–10
- TeamSolo or up to 2
- You needHousehold materials
Prerequisites: None beyond your class work
Original · by TechnifyedExperimentScience Fair ProjectBeginner friendlyLow costTwo subjects
Overview
Compare how fast air and carbon-dioxide-rich air warm under the same lamp.
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.
- Hot surfaces and liquids can burn. Use tongs or oven gloves and let things cool before touching them.
Materials and tools
- Two identical clear bottles
- Two thermometers
- Baking soda and vinegar
- Lamp
- Clay to seal
Tools and software
Step-by-step roadmap
Start
You will finish with: heating and cooling curves and a careful statement of what the model does and does not show.
- 1
Prerequisites
Nothing special to know first. Then collect the 5 items in the materials list.
- 2
Learn
Read up on thermodynamics: carbon dioxide, climate, heat. Your textbook chapter and one short video are enough.
- 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
- Fix a thermometer in each bottle at the same height.
- Make carbon dioxide in one bottle with baking soda and vinegar, then seal both.
- Place both the same distance from a lamp.
- Record temperatures every 2 minutes for 30 minutes, then during cooling.
- Plot both curves on one graph.
- 5
Test
Repeat every reading at least three times and check the result against what the science predicts.
- 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
- 8
Publish
Share the report and photos with your class, a science fair or your school magazine.
Expected outcome
Heating and cooling curves and a careful statement of what the model does and does not show.
Other versions of this project
Advanced version
Repeat five times and test whether the difference is larger than the spread between runs.
Science fair mode
Text marked "You write this" is a prompt for your own work; everything else is specific to this project.
- Problem
- You write thisWrite your question as: How does [what you change] affect [what you measure]?
- Hypothesis
- If a bottle holds more carbon dioxide, then it will reach a higher temperature under the same lamp.
- Variables
- Independent: gas in the bottle. Dependent: temperature rise. Controlled: lamp distance, bottle size, starting temperature
Materials and procedure are in Materials and the Roadmap.
Observation table
You write thisDraw a table with one column for what you change, one for each repeat reading and one for the average.
- Graph
- You write thisPlot what you changed along the bottom and what you measured up the side; use a bar chart for categories and a line graph for numbers.
- 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 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?
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
Prepare your own answers to these before you present.
- What is the aim of your project, in one sentence?
- What is the principle behind it?
- Why did you choose these materials or tools?
- What result did you get, and was it what you expected?
- What went wrong and how did you fix it?
- How could this be improved or used in real life?
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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