Lesson eLearning

A sealed plastic bag of volume 1.5 m³ at sea level has internal pressure equal to 1 atm (1013 hPa). If the bag is taken to an altitude where the barometric pressure drops by 15 %, what is the pressure inside the bag (in hPa)?

medium 2 marks Class 6 · Science · Air Around Us
Answer
861 hPa

The correct answer is 861 hPa — Rounded to the nearest hPa, the pressure is 861 hPa.

Step-by-step solution

  1. 1 atm equals 1013 hPa.
  2. A drop of 15 % means the pressure becomes 1013 × 0.85 = 861.05 hPa.
  3. Rounded to the nearest hPa, the pressure is 861 hPa.
Common mistake: Subtracting 15 hPa instead of 15 %

Concept tested: Pressure variation with altitude

Published · How this solution was prepared and checked

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