Which is heavy 1kg iron or 1kg cotton?

Описание: In this video, I'll show you which one is heavier, 1kg of iron or 1kg of cotton. It's essential for every curious mind to understand how to identify which one is heavier, 1kg of iron or 1kg of cotton. From BASIC IDEA to FACTUAL THEORIES you'll learn here which one among 1kg of iron and 1 kg of cotton is heavy.
Source: Quora

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Here's what you'll see in this video:
0:00 Introduction
0:26 Newton's second law of gravitation
01:23 Concept of Buoyant force in fluid statics
01:52 Conclusion

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