Compressed hydrogen

{{Short description|Gaseous state of the element hydrogen kept under pressure}}

{{one source |date=March 2024}}

{{Infobox fuel

| name = Compressed Hydrogen

| image = Blue diamond compressed hydrogen.jpg

| caption =

| image2 = DOT Hazardous Material Placard compressed hydrogen.jpg

| caption2 =

| IUPAC = Compressed hydrogen

| other_names = Hydrogen under pressure, CGH₂, CGH2

| UN_number = 1049, Class 2

| IMO = 1049, Class 2.1

| DOT = 1049, Class 2.1

| ADR = 1049, Class 2.1

| IATA = 1049, Class 2.1

| WHMIS = A, B1

| RTECS = MW8900000

| PEL-OSHA = Simple asphyxiant

| ACGIH_TLV-TWA = Simple asphyxiant

| appearance = Colorless, odorless

| LEL = 4 %

| UEL = 75 %

| auto_ignition = {{convert|500|C|abbr=on}}

}}

Compressed hydrogen (CH₂, CGH₂ or CGH2) is the gaseous state of the element hydrogen kept under pressure. Compressed hydrogen in hydrogen tanks at 350 bar (5,000 psi) and 700 bar (10,000 psi) is used for mobile hydrogen storage in hydrogen vehicles.[http://www.fsec.ucf.edu/en/consumer/hydrogen/basics/documents/task2_gaseous_h2.pdf Compressed Hydrogen Storage] It is used as a fuel gas.