Is there an equation that relates viscosity of water to temperature? If not, is there a reliable table somewhere on the internet? I'm searching for the viscosity at 20°C ± 3°C.

 

For most liquids De Guzman's equation is used.

viscocity = A exp(B/RT)

Where A, B are +ve constants.

Unfortunately water is the odd man out due to hydrogen bonding and you get funny results for A and B.

 

Water is strange stuff by just about any measuring stick. Odd that there's so much of it!