A volatile liquid is placed in a test tube and the tube is closed with a stopper with a hole in it. The test tube is placed in a hot water bath. The liquid vaporizes and excess vapors escape through the hole. The tube is then placed in an ice bath to quickly cool the vapor and cause it to condense. The mass of the tube is determined. Kit Includes: 2 x 25mL Methyl Alcohol 2 x 25mL Isopropyl Alcohol DOT Info: Small quantity exemption 173.4 THIS PACKAGE CONFORMS TO 49 CFR 173.4 for domestic highway or rail transport only WARNING: This product can expose you to chemicals including Methanol, which is known to the State of California to cause reproductive harm. For more information go to http://www.P65Warnings.ca.gov.