ANS:B - 5 to 10

The Prandtl number (Pr) for water typically ranges from 5 to 10. The Prandtl number is the ratio of momentum diffusivity (kinematic viscosity) to thermal diffusivity. For water, which is a common fluid, its Prandtl number falls within the range of 5 to 10, indicating that it has moderate thermal diffusivity relative to its momentum diffusivity. So, the correct answer is: 5 to 10