Product Description:
ZhengzhouHigh-purity gasHigh Purity Methane
Definition of Technical Terms
Chinese Name:
Methane
Product Name:
methane;CH4 
Definition:
A greenhouse gas primarily emitted from rice paddies and wetlands.
Field of Study:
Ecology (First-level Discipline); Global Ecology (Second-level Discipline)
Methane molecular structure diagram
Methane is widely distributed in nature and is the main component of natural gas, biogas, oil field gas, and mine shaft gas. It can be used as fuel and as a raw material for producing hydrogen, carbon black, carbon monoxide, acetylene, hydrocyanic acid, formaldehyde, and other substances. Its chemical symbol is CH₄.
Methane Physical Properties
Methane has a weight ratio to air of 0.54, which is about half the weight of air. Methane is poorly soluble; at 20°C and 0.1 kilopascals, 100 units of water can only dissolve 3 units of methane. Additionally, methane burns to produce a bright blue flame, but it may appear green due to the use of glass tubes in burning methane. The glass used contains sodium elements during manufacturing, which impart a yellow flame color. Since methane burns blue, the mixture appears green.
Melting Point: -182.5°C
Boiling Point: -161.5℃
Steam Pressure: 53.32 kPa / -168.8℃
Saturated Vapor Pressure (kPa): 53.32 (-168.8°C)
Relative Density (water = 1) 0.42 (-164°F)
Relative Vapour Density (Air = 1): 0.55
Combustion Heat: 890.31 KJ/mol
Total Heat Output: 55,900 kJ/kg (40,020 kJ/m³)
Net Calorific Value: 50,200 kJ/kg (35,900 kJ/m³)
Critical Temperature (℃): -82.6
Critical Pressure (MPa): 4.59
Explosion Limit (%) (V/V): 15
Lower Explosive Limit (% V/V): 5.3
Flash Point (°C): -188
Ignition Temperature (°C): 538

Molecular diameter: 0.414 nm