Lesson 0. Introduction to Physical Pharmacy

Barometer

• Specific instrument used to measure the barometric/atmospheric/air pressure

• It can also measure the vapor pressure of a liquid

atm, bars, mmHg or Torr, Pa or N/m², and kPa

units of barometric pressure

atm

unit of barometric pressure which is defined as the average air pressure at sea level at a temperature of 15 degrees C

Pa or N/m²

SI unit of barometric pressure

1

Conversion Factors of Barometric Pressure:
_ atm = _ bars = _ mmHg or Torr = _ Pa or N/m² = _ kPa

atm = ?

1.013

Conversion Factors of Barometric Pressure:
_ atm = _ bars = _ mmHg or Torr = _ Pa or N/m² = _ kPa

bars = ?

760

Conversion Factors of Barometric Pressure:
_ atm = _ bars = _ mmHg or Torr = _ Pa or N/m² = _ kPa

mmHg or Torr = ?

101325

Conversion Factors of Barometric Pressure:
_ atm = _ bars = _ mmHg or Torr = _ Pa or N/m² = _ kPa

Pa or N/m²= ?

101.325

Conversion Factors of Barometric Pressure:
_ atm = _ bars = _ mmHg or Torr = _ Pa or N/m² = _ kPa

kPa = ?

Manometer

measures water pressure

Mercury Barometer

• It uses a long glass tube, open at one end and closed at the other

• Air pressure is measured by observing the height of the column of mercury in the tube

30 inches

height of Mercury Barometer

directly

In the Mercury Barometer, the atmospheric pressure is _____________ proportional to the height of the mercury

thermal expansion

The problem with the Mercury Barometer is that it experiences a._______________ during the hot weather. To fix this, we need to calibrate the Mercury Barometer to b._____ prior to reading.

a = ?

15 degrees C

The problem with the Mercury Barometer is that it experiences a._______________ during the hot weather. To fix this, we need to calibrate the Mercury Barometer to b._____ prior to reading.

b = ?

Vernier Slider

1 = ?

Sliding Vernier (Bottom)

2 = ?

Upper Meniscus of Mercury

3 = ?

Interpolation

Mathematical method to determine values using data points