Class 5 Notes - Weight

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Introduction

Weight is a measure of how heavy an object is. It is an important concept in daily life, science, and mathematics. The standard unit of weight in the metric system is the gram (g) and kilogram (kg).

Units of Weight

Metric System

  • Milligram (mg) - The smallest unit of weight
  • Gram (g) - A standard unit of weight
  • Kilogram (kg) - 1 kg = 1000 g
  • Ton (t) - 1 ton = 1000 kg

Customary System

  • Ounce (oz) - Small unit of weight
  • Pound (lb) - 1 lb = 16 oz
  • Ton (t) - 1 ton = 2000 lb

Weight Conversions

  • 1 kg = 1000 g
  • 1 g = 1000 mg
  • 1 lb ≈ 0.453 kg
  • 1 oz ≈ 28.35 g

Examples

Example 1: Convert 2.5 kg to grams.

Solution: 2.5 × 1000 = 2500 g

Example 2: If a watermelon weighs 3.5 kg and a melon weighs 2.2 kg, what is their total weight?

Solution: 3.5 + 2.2 = 5.7 kg

Applications of Weight Measurement

  • Cooking and baking (measuring ingredients)
  • Weighing objects in markets and shops
  • Measuring body weight
  • Calculating luggage weight at airports

Conclusion

Understanding weight is essential in everyday life. It helps in measuring, comparing, and converting weights across different units.