- #1
sgstudent
- 739
- 3
In a liquid, when we use P=hρg, how do we take the h? I always thought that we take it from the bottom of the liquid but in a question, they showed that you can take it from the top so I'm pretty confused about this. Here is an example: http://postimage.org/image/oki3fq131/full/
So from this I'm pretty confused about what direction my pressure will act on. Is it upwards or downwards? Because in this example, i took the pressure of the liquid to act downwards: http://postimage.org/image/bbf5ow2mj/full/
so I'm really confused about the direction of pressure in the liquid. Since the pressure can exert a upwards force then aren't my assumptions wrong in the second image? Can someone clear this up for me? Thanks for the help!
So from this I'm pretty confused about what direction my pressure will act on. Is it upwards or downwards? Because in this example, i took the pressure of the liquid to act downwards: http://postimage.org/image/bbf5ow2mj/full/
so I'm really confused about the direction of pressure in the liquid. Since the pressure can exert a upwards force then aren't my assumptions wrong in the second image? Can someone clear this up for me? Thanks for the help!
Last edited by a moderator: