how do we prove that exhaled air has carbon dioxide

When carbon dioxide is passed through lime water it turns lime water milky. We can use this principle. If we exhale into lime water directly or through a straw, lime water will turn milky showing presence of CO2.

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because the air outside contain carbon dioxide

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If you will exhale in the limewater, it will turns to milky if CO2 is there...that will give you the proof that we exhale CO2 gas.

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