# turbulence

How does a smooth flow suddenly become turbulent? The Reynolds number helps understand the transition.

Soon you will be able to step inside a mathematical space and experience the beauty and importance of maths!

It's not just evil villians who can blow smoke rings, it seems peat moss has been doing it for millennia.

Describing the motion of fluids is a huge and unsolved mathematical problem. There are equations that seem to describe it well, but their complete solution is way beyond reach. But could there be a simpler method? The physicist

**Jerry Gollub**tells*Plus*about a new discovery which combines experiment with sophisticated maths.Can researchers solve the mathematics of turbulence at the smallest scale?

*Plus*talks to

**Christine Hogan**, programmer, sysadmin and author, now studying aerodynamics and hoping to become a member of a Formula One team.

Have you ever noticed what happens when you spin a coin on a table? As the coin starts to fall over and roll on its edge, its spin gets faster and faster until it suddenly stops altogether.

Here is an experiment that you can easily do yourself to test Bernoulli's equation. There are also 2 questions and answers.