measuring atmospheric pressure

Diagram shows an instrument for measuring atmospheric pressure.The instrument is placed in a laboratory at sea level. Space X is vacuum.
Rajah menunjukkan satu alat pengukuran bagi mengukur tekanan atmosfera. Alat pengukuran itu diletakkan dalam makmal pada aras laut. Ruang X adalah vakum.

(a) What is the name of the instrument as shown?

     Apakah nama alat pengukuran yang ditunjukkan?

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(b) What is the pressure of space X?
     Apakah tekanan ruang X?

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(c)  What is the atmospheric pressure in the laboratory, in cm Hg?
      Apakah tekanan atmosfera dalam makmal, dalam cm Hg?

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(d) The density of mercury is 13600 kg m^-3 . Calculate the atmospheric pressure, in pascal unit?
      Ketumpatan mercury ialah 13600 kg m^-3. Hitungkan tekanan atmosfera, dalam pascal?

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 (e) The glass tube is moved downwards into the beaker with a vertical distance of 5.0 cm. What happens to the length to the length of the mercury column h?
      Tiub kaca itu diturunkan kedalam bikar secara menegak sedalam 5.0 cm. Apakah yang berlaku kepada panjang turus merkuri.h?

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Answers

Jawapan

Foretine Barometer//Mercury Barometer

Zero

76 cm Hg

P = hρg

=0.76 x 13600 x 10

= 1.25 x 10³ Pa

No change // same