Why Is Rubbing Alcohol 70%, 91%, or 99%? The Surprising Reason

Why does rubbing alcohol come in 70%, 91%, and 99%? And why can 70% isopropyl alcohol sometimes work better than 99% for disinfecting? The answer is more surprising than you might think. These three concentrations aren't simply different levels of strength. They reveal a fascinating story about chemistry, water, distillation, and how rubbing alcohol is manufactured. In this video, we explore how isopropyl alcohol (IPA) is made from petroleum-derived chemicals, why ordinary distillation reaches a limit near 91%, and how manufacturers remove even more water to produce 99% alcohol. You'll also discover why 70% alcohol is commonly used for disinfection, why higher concentrations are useful for certain electronics-cleaning applications, and why stronger doesn't always mean better. From oil refineries to medicine cabinets, discover the hidden science behind one of the most familiar household products. Which rubbing alcohol do you have at home—70%, 91%, or 99%? Let us know in the comments! Subscribe to Small Things for more fascinating explanations of everyday objects, surprising science, and the hidden stories behind ordinary things. #RubbingAlcohol #IsopropylAlcohol #SmallThings --- Timestamp: 00:00 - Intro - Three Bottles, Three Different Numbers 01:02 - What Exactly Is Rubbing Alcohol? 02:06 - The Oil Refinery That Started It All 03:24 - How a Flammable Gas Becomes Alcohol 05:15 - Why Distillation Hits a Wall Near 91% 07:11 - How Manufacturers Reach 99% 08:39 - Why 70% Can Work Better Against Germs 10:32 - From the Factory to the Medicine Cabinet 12:25 - Three Numbers, One Unexpected Story --- ✨ About Small Things Small Things is created by Sarah, Maez, and Hassan — a small team who loves exploring the hidden stories behind simple things and small things. 🤖 Disclaimer: We may use AI tools to support research and production, but every video is reviewed and edited by our team. We respect copyright, original work, and YouTube’s policies. Thank you for supporting us. 🙏 If you notice any issues, please contact us at [email protected] #smallthings #simplethings