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7440-59-7

7440-59-7 structural image
Product Name: HELIUM
Formula: He
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CHEMICAL AND PHYSICAL PROPERTIES

Physical Description Helium appears as a colorless, odorless, noncombustible gas. Can asphyxiate. Inhalation causes the voice to become squeaky (Mickey Mouse voice). Exposure of the container to prolonged heat or fire can cause it to rupture violently and rocket. If liquefied, contact of the very cold liquid with water causes violent boiling. Pressures may build to dangerous levels if the liquid contacts water in a closed container. Used in arc welding, to trace leaks in refrigeration and other closed systems and as a lifting gas for lighter-than-air aircraft.
Color/Form Colorless gas
Odor Odorless
Taste Tasteless
Boiling Point -269
Melting Point -272.2
Solubility 1.5mg/L
Density 1.64 g/L
Vapor Density Relative vapor density (air = 1): 0.14
LogP 0.28
Stability/Shelf Life Chemical stability: Stable under recommended storage conditions.
Viscosity 1.953 at 20 °C, 0.1 MPa; 1.977 at 20 °C, 20 MPa
Heat of Combustion 0.0 J/kmol
Other Experimental Properties Naturally occurring isotopes: He-3; He-4. Isotopes: He-5; He-6; He-7; He-8; He-9; He-10 Table: Decay Pathways [Table#1637]
Chemical Classes Toxic Gases & Vapors -> Simple Asphyxiants

SAFETY INFORMATION

Signal word Warning
Pictogram(s)

Gas Cylinder
Compressed Gases
GHS04
GHS Hazard Statements H280:Gases under pressure
Precautionary Statement Codes P410+P403:Protect from sunlight. Store in a well-ventilated place.

COMPUTED DESCRIPTORS

Molecular Weight 4.00260 g/mol
Hydrogen Bond Donor Count 0
Hydrogen Bond Acceptor Count 0
Rotatable Bond Count 0
Exact Mass 4.002603254 g/mol
Monoisotopic Mass 4.002603254 g/mol
Topological Polar Surface Area 0 Ų
Heavy Atom Count 1
Formal Charge 0
Complexity 0
Isotope Atom Count 0
Defined Atom Stereocenter Count 0
Undefined Atom Stereocenter Count 0
Defined Bond Stereocenter Count 0
Undefined Bond Stereocenter Count 0
Covalently-Bonded Unit Count 1
Compound Is Canonicalized Yes

PRODUCT INTRODUCTION

description

Helium appears as a colorless, odorless, noncombustible gas. Can asphyxiate. Inhalation causes the voice to become squeaky (Mickey Mouse voice). Exposure of the container to prolonged heat or fire can cause it to rupture violently and rocket. If liquefied, contact of the very cold liquid with water causes violent boiling. Pressures may build to dangerous levels if the liquid contacts water in a closed container. Used in arc welding, to trace leaks in refrigeration and other closed systems and as a lifting gas for lighter-than-air aircraft.

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