A sealed balloon is used to illustrate Charles's law because it holds:
AA vacuum inside of it
BA liquid under pressure
CFixed air at fixed pressure
DA changing amount of air
Answer & Solution
Correct answer: C. Fixed air at fixed pressure
1. Each gas law needs two quantities held constant.
2. If we fill a balloon with air and seal it, the balloon contains a specific amount of air at atmospheric pressure.
3. Sealing fixes the amount and the flexible skin keeps the pressure at roughly 1 atmosphere.
4. That leaves volume free to respond to temperature, which is exactly Charles's law.
5. The syringe example fixes temperature instead, giving Boyle's law.
_Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 9 'Gases', sections 9.1-9.6_
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