weight - Sub Topics

  • What is Weight?
  • Heavy and Light
  • Measuring Weights
  • Units of Weight
  • Conversions of Units of Weight
  • Solved Questions on Weight
  • In this chapter, we are going to explore the topic of weight. Have you ever asked yourself why some things weigh as much as a bag filled with books while others weigh as little as a piece of paper?

    What is Weight?

    Weight is the measure of how heavy something is.

    When you pick up a rubber ball or a football, you can feel its weight in your hand.


    Heavy and Light

    Heavy is a term used to describe something that has more weight.

    For example: Mountains, ostriches, elephants, hippopotamuses and rhinoceros are heavy.


    Light is a term used to describe something that has less weight.

    For example: Feathers, balloons, paper, hair and cotton are light.


    Feather has a lightweight whereas pot has a heavyweight, as shown in the figure below:


    Measuring Weights

    Weighing balance, beam balance and weighing scale are used to measure the weight which is displayed as follows:


    Units of Weight

    The weight of an object can be measured using various units of measurement such as grams, kilograms, quintals, pounds, ounces, etc.

    Below is a list of some of the types of units we use:

    a. Gram (g)
    b. Kilogram (kg)
    c. Pound (lbs)
    d. Ounces (oz)

    Conversions of Units of Weight

    The conversion of the unit of weight is shown as:

    Kilograms (kg) to Grams (g):

    → 1 kilogram (kg) is equal to 1000 grams (g).
    → To change kilograms to grams, you simply need to multiply by 1000.
    → For example, 11 kg × 1000 = 11000 g

    Pound (lbs) to Ounces (oz):

    → 1 pound (lbs) is equal to 16 ounces (oz).
    → To convert pounds to ounces, you should multiply by 16.
    → For example, 3 lbs × 16 = 48 oz

    Let us solve some more examples to understand them better.

    Example 1: What is the weight of a jar of honey in oz if its weight is 9 lbs?


    a) 94 oz
    b) 124 oz
    c) 144 oz
    d) 164 oz

    Answer: c) 144 oz

    Explanation: Weight of a jar = 9 lbs (pounds)
    Weight of a jar in ounces = 9 × 16
                                    = 144 oz (ounces)

    Example 2: The weight of a flour packet is 4 kilograms 400 grams. What is the weight of the packets shown in the figure?


    a) 16 kg 200 g
    b) 16 kg 400 g
    c) 26 kg 400 g
    d) 36 kg 400 g

    Answer: c) 26 kg 400 g

    Explanation: Weight of a flour packet = 4 kg 400 g
    = 4 kg + 400 g
    = 4 × 1000 g + 400 g
    = 4000 g + 400 g = 4400 g
    Weight of 6 flour packets = 4400 g × 6
    = 26400 g
    = 26000g + 400 g
    = 26 × 1000 g + 400 g
    = 26 kg + 400 g
    = 26 kg 400 g

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