Atmospheric Pressure

[verb]

Hi all. I'm trying to do some research for some final coursework that is long over due.

 

I have two questions:-

 

1. What is the name of the devise that can suck the air/oxegen out of an object?? i.e. a beaker... (For the life of me I cant think)

 

2. Does this reduce or increase the Atmospheric Pressure inside the object??

[DJBruce]

Hi all. I'm trying to do some research for some final coursework that is long over due.

 

I have two questions:-

 

1. What is the name of the devise that can suck the air/oxegen out of an object?? i.e. a beaker... (For the life of me I cant think)

 

2. Does this reduce or increase the Atmospheric Pressure inside the object??

 

A vacuum pump can remove most of the air from inside of beaker, although it is impossible to create a perfect vacuum. Here is a company who sells pumps specfically for chemistry labs, I don't have any experience with the company they simply came up in my search.

 

If you use a vacuum pump to remove the air from inside a container the pressure inside drops.

Edited August 18, 2009 by DJBruce

[hermanntrude]

A vacuum pump can remove most of the air from inside of beaker, although it is impossible to create a perfect vacuum. Here is a company who sells pumps specfically for chemistry labs, I don't have any experience with the company they simply came up in my search.

 

If you use a vacuum pump to remove the air from inside a container the pressure inside drops.

 

 

our policy on homework (or coursework) help, even if it isnt in the homework help forum, is to NOT directly answer it. Give the poster clues or references and links so that they can figure it out for themselves.

[CaptainPanic]

2. Does this reduce or increase the Atmospheric Pressure inside the object??

Atmospheric pressure = 101325 Pa, or 1.01325 bar, or 1 atm. (<-- all the same thing)

Atmospheric pressure is considered a constant, and can therefore not be changed.

 

But if you remove air, then you reduce pressure where you remove it... and the pressure is not "atmospheric" anymore... but instead is lower than atmospheric.

 

our policy on homework (or coursework) help, even if it isnt in the homework help forum, is to NOT directly answer it. Give the poster clues or references and links so that they can figure it out for themselves.

Question #2 is phrased so poorly that I really hope that this isn't a homework question.