Helium is the least dense substance in the world, with a density of 0.08988 g/cc. This light, non-toxic, and inert gas is incredibly low in density, making it ideal for a variety of applications.

Helium is commonly used in balloons, airships, and blimps due to its low density, which allows these objects to float effortlessly in the air. It is also used in cryogenics, as a coolant for superconducting magnets, and in various industrial processes.

Despite its low density, helium is actually quite abundant in the universe. It is the second most abundant element in the universe, after hydrogen, and is produced through nuclear fusion in stars. However, on Earth, helium is relatively rare and is typically extracted from natural gas deposits.

Helium's low density also makes it a popular choice for filling airships and balloons for scientific research and recreational purposes. In fact, the Hindenburg airship, which famously caught fire in 1937, was filled with hydrogen instead of helium, which is why it was so flammable.

Overall, helium's unique combination of low density, inertness, and abundance make it a valuable substance for a wide range of applications. Whether it's lifting balloons into the sky or cooling superconducting magnets, helium plays a crucial role in many industries and scientific endeavors.

For more information on helium and its properties, you can visit the following websites:

• Chemicool - Helium
• Live Science - Helium Information
• PubChem - Helium Compound Information

So next time you see a balloon floating in the sky, remember that it's helium's low density that's keeping it there!

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