After heating some glass bottles to a very high temperature with a bonfire the bottles changed shape as you would expect molten glass to do, but once the bottles returned to ambient temperature they were extremely brittle. What is happening to cause this? I read that annealing requires heating...
To Cesium:
Your thermometer should have the top of it's bulb just below the joint where your condesnser attaches. To get a good reading of ethanol content you can use a device called a hydrometer. You can find them that go up to 200 proof in 2 proof (1% ethanol) increments. You should be...