An exhaled air bubble underwater at 290.
kPa has volume 18.9mL. What will be its
volume at the water's surface where the
pressure is 104kPa. (Why must a diver
exhale during ascent?)

The answer for the following problem is mentioned below.

Therefore the final volume of the gas is 52.7 ml.

Explanation:

Given:

Initial pressure () = 290 kPa

Final pressure () = 104 kPa

Initial volume () = 18.9 ml

To find:

Final volume ()

We know;

From the ideal gas equation;

    P × V = n × R × T

where;

P represents the pressure of the gas

V represents the volume of gas

n represents the no of the moles

R represents the universal gas constant

T represents the temperature of the gas

So;

   P × V = constant

   P ∝

From the above equation;

             

represents the initial pressure of the gas

represents the final pressure of the gas

represents the initial volume of the gas

represents the final volume of the gas

Substituting the values of the above equation;

                    =

              = 52.7 ml

Therefore the final volume of the gas is 52.7 ml.

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant. 

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