Glass.Ceramic heating, Movie Library Direct heating of water in test tubes Friday March 22nd, 2024 HEAT-TECH info This video shows a halogen glass rod heater inserted into water in a test tube and heated. Please check the following site for more information. Related page: Heating water in a test tube No.1 Cold air cooling of test tubes No.21 Heating of test tubes No.11 Heating the upper part of the test tube Heat resistance test of hot water cutting holes in the cup chow mein No.1 Heating the liquid in the test tube Removal of permanent marker markings on quartz tubes Pinpoint heating of solder