what is the difference between atmospheric …

The atmospheric pressure is the pressure that an area experiences due to the force exerted by the atmosphere.

Vacuum is ideally an area which is devoid of any matter that means in vacuum the atmospheric pressure is zero. 

vacuum pressure is measured as the difference between atmospheric pressure and absolute pressure. (Absolute pressuer : actual pressure at given position)

Vaccuum is the region where pressure is zero and even the sound cannot propagate in vaccuum .The atmospheric pressure is the pressure exerted by the air at sea level and it is taken as 1 atm as standard value.

Vacuum, is a region without any matter, or a region of zero pressure (perfect vacuum). It is practically impossible to create perfect vacuum. So real vacuum should actually be defined as a region <i>almost </i>devoid of matter, or of very low pressure.


Vaccum is a non-existent word. It is just a spelling mistake of the former. Other common spelling mistakes made in writing vacuum are <i>vacume, vacum, vaacum, vaccuum</i>

Absolute pressure : is zero-referenced against a perfect vacuum, so it is equal to gauge pressure plus atmospheric pressure. Gauge pressure : is zero-referenced against ambient air pressure, so it is equal to absolute pressure minusatmospheric pressure. Negative signs are usually omitted.