Digital CO2 Sensor
The Carbon Dioxide sensor measures CO2 concentration in air in the range 350 and 10,000ppm – ideal for measuring plant and animal respiration and pollution. Use the sensor to record plant CO2 output over day and night. During the day, plants use carbon dioxide during photosynthesis so the overall CO2 concentration will decrease. At night, photosynthesis stops, so CO2 will increase due to output from respiration. This also applies to summer and winter, so seasonal variations can be logged. An investigation into human respiration can be done by comparing the gas breathed in and out each breath. Seal the sensor in an airtight bag, have a student breath in and out of the bag and watch as the CO2 concentration gradually increases. Compare the carbon dioxide production of a person at rest and a person recovering from exercise. It is possible to test air quality in different places. Create a map showing where CO2 concentration is higher, and compare this to levels that are toxic to humans. A wide range of investigations into pollution can be carried out, particularly relevant in an age where carbon footprints are at the top of political agendas.