Debunking the Myth: Does 1 Cubic Meter of Air Really Weigh 1kg?

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SUMMARY

The discussion clarifies that 1 cubic meter of air does not weigh exactly 1 kg; it weighs approximately 1.29 kg at 15 degrees Celsius and one atmosphere of pressure. Participants highlighted the distinction between mass and weight, emphasizing that the perceived weight of air in a balloon differs based on the surrounding environment, such as on Earth versus the Moon. The conversation also referenced the density of air and included a link to Wikipedia for further details.

PREREQUISITES
  • Understanding of basic physics concepts such as mass and weight
  • Familiarity with the properties of air, specifically its density
  • Knowledge of atmospheric pressure and its effects on weight
  • Basic understanding of the differences between Earth and lunar gravity
NEXT STEPS
  • Research the density of air at various temperatures and pressures
  • Explore the principles of buoyancy and upthrust in different environments
  • Learn about the differences between mass and weight in physics
  • Investigate the effects of gravity on weight in various planetary bodies
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Students of physics, educators teaching basic science concepts, and anyone interested in the properties of air and the principles of buoyancy and gravity.

quantum123
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Does 1 metre cube of air really weigh 1kg?
This is so hard to believe. So heavy?
 
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if it was air in a 1 metre cube balloon, it would appear to be of no/low weight on Earth because it's surrounded by air. if you bring that same balloon to the moon, you will feel the weight.

consider that mass and weight are not used the same way and have different definitions
 
well, if you bring it to an earth-sized planet with no atmostphere*
 
I get you. Thanks!
The upthrust is equal to the weight of the air itself.
 
Right. It's also not quite a kilogram. Looks to be about 650 g.
 
My bad. Nitrogen is diatomic. (Smacking forehead)
 
So physicist calculate while engineers and mathematicians look it up on the wiki...?
 

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