ENVIRSC 1A03 Lecture Notes - Lecture 3: Shaving Cream, Ideal Gas Law, Atmospheric Pressure
3 Feb 2014
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Ideal gas law states that p= prt: p is the pressure in pa (pascals) p is the air density (kg/m3, r is the constant in (j/kgk, t is the temperature in kelvin (k) Air pressure decreases with the increasing of altitude: at the top of mt. Everest, a climber would be above about 60% of the air molecules in the atmosphere. A climber would need to bring oxygen due to the decrease in concentration of oxygen at a higher altitude. Pressurized cans of shaving cream advise users not to expose the produce to excessive heat. Heating the can will increase the kinetic energy of the molecules in the can and would result in an explosion. Pressure decreases over time, and it may not produce the same result if this experiment was done throughout the life of the product. A standard pressure of 1013. 2 hpa is also known as one atmosphere (1 atm). 1atm is at almost 0km, 5. 5 km is.
