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if you have not already done so, convert 70 mmhg and 120 mmhg into si pressure units. now that your pressures are in si units, critically think about your original claim regarding the heart’s blood pressure as either gauge pressure or absolute pressure. how does this pressure compare to atmospheric pressure? justify your reasoning regarding gauge pressure vs. absolute pressure in terms of how the body pressure compares to atmospheric pressure, which is also a pressure that is being (nearly) uniformly externed on the body at all times.



Answer :

70 mmHg will convert to 9.333kpa pressure SI units while 20 mmHg will convert to 16kpa pressure SI units.

Absolute pressure for 70 mmHg is 110.658kpa

Absolute pressure for 120 mmHg is 117.325kpa

Converting 70 mmHg and 120 mmHg into SI pressure units:

If 760 mmHg=101.325kpa

      ∴ 70 mmHg=?

        = 70*101.325/760

         =9.333kpa

So 70 mmHg will be 9.333kpa

If 760 mmHg=101.325kpa

     ∴120 mmHg=?

      =120*101.325/760

      =16kpa

So 120 mmHg will be 16kpa

Blood pressure is generally measured in mmHg because mercury is used in the thermometers, so it is convenient to measure the pressure by rise in height of mercury in the thermometer.

However pressure measured by the thermometer is always gauge pressure, given by:

[tex]P_{gauge} =P_{abs} -P_{0}[/tex], where [tex]P_{0}[/tex] is atmospheric pressure and [tex]P_{abs}[/tex] is absolute pressure.

We now calculate absolute pressure for [tex]P_{1}[/tex] 70 mmHg and [tex]P_{2}[/tex] 120 mmHg,

[tex]P_{1} abs=P_{1} g+P_{0}[/tex]

         [tex]=101.325+9.333[/tex]

        =110.658kpa

[tex]P_{2} abs=P_{2} g+P_{0[/tex]

        =101.325+16

        =117.325kpa

Learn more about pressures here:

https://brainly.com/question/6984092

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