Question - What are the key physico-chemical characteristics of the chemical warfare/terrorism agent sulfur mustard?
Answer - Sulfur mustard (HD) is a thick liquid at ambient temperature, but becomes a solid at 58 °F. It is heavier than water as a liquid and heavier than air as a vapor. It does not occur naturally in the environment. It is often called mustard gas, but sulfur mustard is not likely to change into a gas immediately if it is released at ordinary temperatures. As a pure liquid, it is colorless and odorless, but when mixed with other chemicals, it looks brown and has a garlic-like smell. (https://www.atsdr.cdc.gov/substances/toxsubstance.asp?toxid=184; accessed December 2018)
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