I was taught a rule of thumb tHat water is 15 times denser than air- have no idea if this is accurate, but it helps me to fathom current vs. Breeze issues.
The density of air is about 1.22 kg/m3 at sea level at moderate temperatures. The density of pure water at precisely defined standard conditions is exactly 1000 kg/m3. The density of sea water is about 1025 kg/m3. Therefore sea water is about 840 times as dense as air!