1) "Helium" -- As to helium balloon
helium

helium can be found at Merriam-WebsterUnabridged.com. Click here to start your free trial!

Click here to search for another word in the Merriam-Webster Online Dictionary.
Pronunciation Symbols

For other uses of this term, see Helium (disambiguation).

2) "Balloon" -- As to helium balloon
¹bal�loon
Pronunciation: b&-'lün
Function: noun
Etymology: French ballon large football, balloon, from Italian dialect ballone large football, augmentative of balla ball, of Germanic origin; akin to Old High German balla ball -- more at BALL
1 : a nonporous bag of light material that can be inflated especially with air or gas: as a : a bag that is filled with heated air or a gas lighter than air so as to rise and float in the atmosphere and that usually carries a suspended load (as a gondola with passengers) b : an inflatable bag (as of rubber or plastic) usually used as a toy or for decoration
2 : the outline enclosing words spoken or thought by a figure especially in a cartoon
Pronunciation Symbols

Balloons, like greeting cards or flowers, are given for special occasions.
A balloon is a flexible bag normally filled with a gas, such as helium, hydrogen, nitrous oxide or air. Some balloons are purely decorative, others are used for specific purposes. Early balloons were made of dried animal bladders. Modern balloons can be made from materials such as rubber, latex, chloroprene or a nylon fabric. The modern balloon was invented by Michael Faraday in the 1800s, but mass production did not occur until the 1930s. A balloon's unique properties including its low density and relative inexpensivness have lead to a wide range of applications.

2 hydrogen ← helium → lithium

-
↑
He
↓
Ne

General

Name, Symbol, Number helium, He, 2

Chemical series noble gases

Group, Period, Block 18, 1, s

Appearance colorless

Atomic mass 4.002602(2) g·mol⁻¹

Electron configuration 1s²

Electrons per shell 2

Physical properties

Phase gas

Density (0 °C, 101.325 kPa)
0.1786 g/L

Melting point (at 2.5 MPa) 0.95 K
(-272.2 °C, -458.0 °F)

Boiling point 4.22 K
(-268.93 °C, -452.07 °F)

Critical point 5.19 K, 0.227 MPa

Heat of fusion 0.0138 kJ·mol⁻¹

Heat of vaporization 0.0829 kJ·mol⁻¹

Heat capacity (25 °C) 20.786 J·mol⁻¹·K⁻¹

Vapor pressure (defined by ITS-90)
P(Pa) 1 10 100 1 k 10 k 100 k

at T(K) - - 1.23 1.67 2.48 4.21

1 Applications

1.1 Decoration or entertainment

1.2 Flying machines

1.3 Medicine

2 In film

3 See also

4 External links

4.1 Notes

Decorative arches made of party balloons.
Party balloons are mostly made of natural latex tapped from rubber trees and can be filled with air, helium, water, or any other suitable liquid or gas. The rubber allows for elasticity which makes the volume adjustable. Most of this rubber is made from recycled material, such as old tires and tennis shoes.

Filling with air is done with the mouth, with a manual or electric inflator (such as a hand pump) or a source of compressed air.

When rubber balloons are filled with helium so that they float they can hold their lift for only a short time depending on the size of the balloon, the time can vary from 18 hours to several days. The enclosed helium atoms escape through small pores in the latex which are larger than the helium atoms. Balloons filled with air can hold their size and shape much longer.

Even a perfect rubber membrane eventually loses the gas to the outside. The process by which a substance or solute migrates from a region of high conce..."

Further Data On Term for helium balloon
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