... filled. Krypton is a colorless, odorless, nontoxic, nonflammable gas. Shipped as a compressed gas. A member of the group of Noble Gases ... .Physical and Chemical Properties PARAMETER VALUE UNITS Physical state (gas, liquid, solid)GAS Vapor pressureAbove critical temp.Liquid density, -452.1 0F ... Solubility (H2O)Negligible Odor thresholdNot available Odor and appearanceColorless, odorless Gas