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Hot air balloon cools at constant pressure: find its new volume

The same question, asked 2 times: 12 May 2024 S1*, 12 May 2026 S1. Every wording below, oldest first.

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  1. Question 1

    12 May 2024 S1

    95
    A hot air balloon has volume of 2000 dm32000\,\text{dm}^{3} at 99∘C99^{\circ}\text{C}. What is the new volume if air in balloon cools to 80∘C80^{\circ}\text{C}?

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  2. Question 2

    12 May 2026 S1

    5
    A hot air balloon has a volume of 2800 dm32800\ \mathrm{dm^3} at 100 ∘C100\ ^\circ\mathrm{C}. What is the volume if air cools to 27 ∘C27\ ^\circ\mathrm{C}?

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