Lesson eLearning

A puddle of water covering 0.04 m² area evaporates 0.5 mm of water in one day. How much water (in millilitres) has evaporated from the puddle in that day?

medium 2 marks Class 5 · EVS · Blow Hot Blow Cold
Answer
20 millilitres.

The correct answer is 20 millilitres. — Convert litres to millilitres: 0.02 L × 1000 = 20 ml.

Step-by-step solution

  1. Convert the evaporated depth to metres: 0.5 mm = 0.0005 m.
  2. Compute the volume evaporated: 0.04 m² × 0.0005 m = 0.00002 m³.
  3. Convert cubic metres to litres: 0.00002 m³ × 1000 = 0.02 L.
  4. Convert litres to millilitres: 0.02 L × 1000 = 20 ml.
Common mistake: Using wrong unit conversions

Concept tested: Evaporation calculation

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