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الكلية كلية التربية للعلوم الصرفة
القسم قسم الفيزياء
المرحلة 1
أستاذ المادة سمير حسن هادي النصراوي
5/3/2011 7:04:56 AM
EXP NO. 3
Boyle s law
Purpose; To measure the pressure of the atmosphere and verifies boyle s law.
Apparatus ;glass tube containing mercury .
Method;
1. Keep the mercury levels X and Y in the same position.
2.Recored the scale reading of these levels and also the scale.
3.Read (A) inside of closed end of the tube (AB) this is the balance point (X=Y).
4.Rising the tube CD above BALANSE POINT" and record the scale reading of X and Y levels.
5. Take about four sets of reading over the" balance point" and record the scale reading of X and Y.
6. Take about four sets of reading below the "balance point".
Reading:
1. Make the following table:
Scale reading (cm)
1/L H=Y-X L=A-X Y X A
2.Plot the graph of the values of "h" cm Y-axis against the corresponding value of "1/L" on X-axis.
Theory and calculation:
1. If a plot of "h" against "1/L"yieldes a straight line ,boyle s law is verified and the negative intercept on the h-axis is numerically equel to "B".
B=atmospheric pressure.
2. h=C/K.1/L-B
C/K=constant
For the graph ;if h=0 then find the value of " C/K".
MEDICAL APPLICATION:
Since we live in a sea of air with a pressure of 1atm it is easier to measuer pressure relative to atmospheric pressure than to measure trau .
There are a number of place in the body where the pressure is lower than atmospheric or negative. for example ,when breath in "inspire" the pressure in the lungs must be some what lower than atmospheric pressure or the air would not flow in .The lung pressure during inspiration is typically a few centimeters of water negative.
When person drinks through straw the pressure in the mouth must be negative by a mount equal to a high of his mouth above the level of the liquid is drinking.
Other example is discussed in chapter "7"and "6" in "medical physics "cameron"
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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