Helium can work against gravity 🙃
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Defying Gravity: The Mystery of Helium: Helium is light. It is the second lightest element on the periodic table, with each atom of Helium containing only two protons. Helium gas is a collection of individual, very light atoms, all keeping their distance from one another. You may have noticed, however, that not all light things float up in the air. Let go of a feather, and it will immediately move downwards, not zoom upwards like a balloon. It almost seems like Helium is immune to the effects of gravity. To help understand why Helium is different, let’s compare the helium balloon to the air around it. Air is made up mostly of oxygen and nitrogen , which are much heavier elements than Helium. Each nitrogen atom has 7 protons , and each oxygen atom has 8. And both nitrogen and oxygen atoms prefer to pair up – meaning air is made up of groups, or molecules, of nitrogen and oxygen, each group having 14 and 16 protons respectively. This means that a litre of air weighs about...
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