Lesson eLearning

A puddle of area 0.05 m² evaporates 0.8 mm of water in 24 hours. Calculate the mass of water evaporated in kilograms. Show all calculations.

hard 4 marks Class 5 · EVS · Blow Hot Blow Cold
Answer
0.04 kg

The correct answer is 0.04 kg — Therefore, 0.04 kg of water evaporated in 24 hours.

Step-by-step solution

  1. Convert the depth of evaporation from millimetres to metres: 0.8 mm = 0.0008 m.
  2. Compute the volume evaporated: 0.05 m² × 0.0008 m = 0.00004 m³.
  3. Convert cubic metres to litres: 0.00004 m³ × 1000 L/m³ = 0.04 L.
  4. Since 1 L of water has a mass of 1 kg, the mass evaporated is 0.04 kg.
  5. Therefore, 0.04 kg of water evaporated in 24 hours.
Common mistake: Not converting millimetres to metres or confusing litre with kilogram.

Concept tested: Volume‑mass conversion in evaporation

Published · How this solution was prepared and checked

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