What is the CAS number for water?

The CAS number for water is 7732-18-5. This unique identifier is assigned by the Chemical Abstracts Service (CAS) to help identify substances in a systematic way. The number consists of three parts, which distinguish it from other chemical substances. Water, being essential for various industrial processes, including refrigeration system operations, is commonly referenced with this CAS number.

The other numerical identifiers correspond to different compounds: 7647-14-5 is the CAS number for hydrochloric acid, 67-56-1 is for methanol, and 50-00-0 is assigned to formaldehyde. Each of these compounds has distinct properties and applications, but none are related to water, thus reinforcing the uniqueness of 7732-18-5 as the identifying number for water.