# Tag Info

Accepted

### Why doesn't oil produce sound when poured?

The noise is generated by turbulent flow. Turbulence in the flow generates turbulence in the air at the interface between the air and the liquid surface, and that turbulence in the air is what we hear ...
• 334k

### Why doesn't oil produce sound when poured?

Actually, two questions: The existence of the sound: The most common source of the flowing liquid sound is air bubbles popping. Surface waves (both over the open surface and inside the bubbles ...
• 6,113
Accepted

### Frequency difference when water splashes at different temperatures

This is a guess since I have never done the experiment, but the viscosity of water falls by a factor of 5 on heating from 5°C to 100°C. The viscosity is one of the two factors (the other being density)...
• 334k
Accepted

### Reason for 6π factor in Stokes' law

It is not determined experimentally, it is an analytical result. It is verified experimentally. As @Mick described it is possible to derive the velocity and pressure field of a flow around a sphere ...
• 3,216