commonly known as relative density, specific gravity is the ratio of density between a particular object and a standardized object such as water and air, acting as a basic comparison. To understand ...

What is mass? It seems like a synonym for weight, but that isn’t quite right. Weight is how we measure the pressure that gravity exerts upon things. But mass? Mass is the actual presence of an item — ...

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Although gravity is as fundamental to our life as breathing, how hard is it to measure it accurately? A group of Chinese researchers recently has measured the most precise estimates for the strength ...