Question Video: Choosing Grams or Kilograms to Measure the Mass of an Object | Nagwa Question Video: Choosing Grams or Kilograms to Measure the Mass of an Object | Nagwa

# Question Video: Choosing Grams or Kilograms to Measure the Mass of an Object Mathematics • Second Year of Primary School

True or False: If we measure the mass of lighter objects, it is better to use kilograms (kg) than grams (g).

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### Video Transcript

True or False: If we measure the mass of lighter objects, it is better to use kilograms than grams.

When we measure the mass of an object, we’re trying to find out how heavy it is. And in our question, we can see two units of measurement that we can use to weigh objects. Can you see them? There’s kilograms, which we often write kg, and grams, for which we often write g. Now, we could use these units of measurement to weigh anything, but it’s not always a good idea. Sometimes it’s better to use one unit of measurement than the other. And this question is asking us about lighter objects. If we’re measuring the mass of lighter objects, is it better to use kilograms or grams?

What do you think we mean by lighter objects? A feather is a light object. This pen is a light object. You could probably say a carrot is a light object too. It’s not heavy, is it? If an object is light, it’s not heavy. Now, if we wanted to measure the mass of these light objects, is it better to use kilograms or grams? To help us understand, we need to remind ourselves how heavy one kilogram and one gram are. One kilogram weighs about the same as a bag of rice. And one gram weighs about the same as the lid of a ballpoint pen.

Now, which unit of measurement do you think it makes sense to measure these light objects with? Would you weigh how heavy they are in bags of rice or in pen lids? If we had a set of scales, we put a bag of rice on one end and one of our light objects on the other, it would come crashing down. A kilogram is much heavier than our light objects. It would be much easier to see how many pen lids weighed the same as a carrot. Grams are generally better for weighing lighter objects and kilograms for weighing heavier objects.

Now, our sentence says, if we measure the mass of lighter objects, it’s better to use kilograms than grams. Well, we’ve just said this isn’t true, is it? The statement is false. Let’s say it the correct way round just to end with. If we measure the mass of lighter objects, it is better to use grams than kilograms.

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