# Fluid Dynamics?!?

The longer a straw, the harder it is to drink from. If the air pressure is 91200 Pa, and if you could create a perfect vacuum in your mouth, what is the maximum length of a straw that you could still drink from? Density of water: 1000kg/m^3. Ignore capillary effects.

### 1 Answer

Relevance

- NCSLv 72 years agoFavorite Answer
So the "head" from the straw would have to equal the given pressure:

ρgh = P

1000kg/m³ * 9.8m/s² * h = 91200 N/m²

so

h = 9.31 m

Hope this helps!

Still have questions? Get your answers by asking now.