Wednesday 31 August 2016

everyday chemistry - How does WD40 displace water?



How does WD-40 displace water? Or does it even displace water? WD40.com explains what WD-40 stands for:



WD-40® literally stands for Water Displacement, 40th formula. That's the name straight out of the lab book used by the chemist who developed the product back in 1953. The chemist, Norm Larsen, was attempting to concoct a formula to prevent corrosion—a task which is done by displacing water. Norm's persistence paid off when he perfected the formula on his 40th try.



If it displaces water then I always thought that that meant it was denser or heavier. I just tested to see: I sprayed a couple teaspoons into an empty glass then poured that into another glass half filled with water. The WD-40 floats! So what does it mean to say that it "displaces water"? Surely it doesn't mean that it's hydrophobic, all lubricants are hydrophobic.




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