The breathalyzer is actually a redox reaction. If the potassium dichromate reacts with ethanol it loses an oxygen atom (gets minimized), likely from your orange dichromate on the environmentally friendly chromium sulfate. When oxygen is cooled to -183℃, it turns into a liquid. Liquid oxygen is used for a propellant https://elliottfowdk.ssnblog.com/35626245/5-simple-statements-about-oxygen-chambers-near-me-explained