Helium
Helium is a chemical element with the symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas that heads the noble gas series in the periodic table. Its boiling and melting points are the lowest among all the elements and it exists only as a gas except in extreme conditions. Helium is the second lightest element and is the second most abundant element in the observable universe, being present at about 24% of the total elemental mass, which is more than 12 times the mass of all the heavier elements combined. Helium is used in a variety of applications, including cryogenics, welding, and as a coolant in nuclear reactors. In space and astronautical engineering, helium is used as a lifting gas in balloons and airships, and as a coolant in rocket engines.
Your Previous Searches
Random Picks
- Rotor: In space and astronautical engineering, a rotor is a rotating part of a machine that is designed to produce a lift force or thrust. Rotors are commonly used in helicopters, quadcopters, and other types of aircraft that require vertical take ... Read More >>
- Vestibular System: The vestibular system is a crucial component of the human body that is responsible for maintaining balance, spatial orientation, and eye movement control. It is located in the inner ear and consists of two main structures: the semicircular ... Read More >>
- Thermal Stress: Thermal stress is the stress caused by the temperature difference between two adjacent parts of a material or a structure. In space and astronautical engineering, thermal stress is a critical factor that affects the design and operation of ... Read More >>
Top News
Bestselling author explains the science of happiness: "You can do the work"...
Bestselling author and Harvard professor Arthur Brooks opens up about how enjoyment, satisfaction and meaning in life can increase a person's wellbeing....
News Source: CBS News on 2024-11-18
November's full moon, known as the Beaver Moon, is the last supermoon of 2024. H...
November's full moon, known as the Beaver Moon, is the last supermoon of 2024. Here's when it peaks and why it's called the Beaver Moon....
News Source: CBS News on 2024-11-15
You can't put a price on the sense of awe particle physics inspires...
Astronomy and particle physics are no longer seen as vital by the US establishment, so funding has fallen. But our work creates a sense of wonder, and wonder matters, says Chanda Prescod-Weinstein...
News Source: New Scientist on 2024-11-13
If you want to stretch your gift game into days this holiday, check out these ad...
The advent calendar phenomenon is growing every year, with so many exciting, fun, beautiful, and delicious options available...
News Source: ABC News on 2024-11-04
November brings a bonanza of meteor showers...
November brings a skywatching bonanza, with three meteor showers — the Southern Taurids, Northern Taurids and Orionids — offering chances to see shooting stars....
News Source: NBC News on 2024-11-02