Product Description:
ZhengzhouHigh-purity gasHigh-purity methane
Definition of Technical Terms
Chinese Name:
Methane
Product Name:
methane;CH4 
Definition:
A greenhouse gas primarily released from rice paddies and wetlands.
Discipline:
Ecology (primary discipline); Global Ecology (secondary discipline)
Methane molecular structure diagram
Methane is widely distributed in nature and is the main component of natural gas, biogas, oil field gas, and coal 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, approximately half the weight of air. Its solubility is minimal; at 20°C and 0.1 kPa, 100 units of water can only dissolve 3 units of methane. Additionally, methane combustion produces a bright blue flame, which may appear green due to the use of glass tubes in the process. The glass, containing sodium during manufacturing, emits a yellow flame color. Since methane burns blue, the combined appearance can seem green.
Melting Point: -182.5°C
Boiling Point: -161.5°C
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 Calorific Value: 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