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What can animals tell us about humans?


1. Which two liquids in the table might be suitable for use as the propellant in aerosols?

2. Is it the gas or liquid in an aerosol that exerts pressure?

3 Would water work as a propellant in an aerosol?

4. Apart from being a propellant, which other job must an aerosol liquid do?

5. Where would an aerosol with butane propellant stop working?

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