A standard drinking straw is 23 cm tall. Pressure difference needed to raise a column of water to that high is to be calculated. Given density of water is 1.0 g/cm 3 and g is 9.80 m/s 2 Concept introduction: Pressure can be defined as a force acting on per unit area i.e., P = F/A, Where, F = force, A = area on which the force is acted. Pressure can be conveniently measured for gases and fluids. The pressure of a liquid or a gas is equal to the density of that liquid multiplied by the acceleration due to gravity and the height of the liquid above the certain point. The standard unit for pressure is Pascal (Pa). Other units of pressure, such as pounds per square inch and bar, are also commonly used. The pressure units can also be expressed in grams-force or kilograms-force per square centimeter, without properly identifying the force units. The standard atmosphere (atm) is approximately equal to typical air pressure at earth mean sea level and is having the value of 101325 Pa. Since, Pressure is most prevalently measured by its tendency to displace a column of liquid in a manometer, it is also expressed as depth of a fluid. For example: Centimeters of water (or) millimeters of mercury.

Question

CPAP is the acronym for "Continuous Positive Airway Pressure". A CPAP device is used in respiratory therapy. Some ambulances carry a CPAP device. The pressure unit used in CPAP devices is "cm H2O". A typical pressure setting on a CPAP device may be 9 cm H2O. Blood pressure is commonly measured in units of mm Hg (or millimeters mercury). Which of the following statements is true regarding the pressure of 1 cm H2O ? Question 17 options: A) 1 in H2O has a lesser pressure than 1 cm H2O. B) 1 in H2O has a greater pressure than 1 cm H2O. C) 1 mm Hg has a lesser pressure than 1 cm H2O. D) None of the above answer choices are correct.

Answer 1

Question

Chapter 1, Problem 1.6E

Interpretation Introduction

Interpretation:

A standard drinking straw is 23 cm tall. Pressure difference needed to raise a column of water to that high is to be calculated. Given density of water is 1.0 g/cm³ and g is 9.80 m/s²

Concept introduction:

Pressure can be defined as a force acting on per unit area i.e.,

P = F/A,

Where, F = force,

A = area on which the force is acted.

Pressure can be conveniently measured for gases and fluids. The pressure of a liquid or a gas is equal to the density of that liquid multiplied by the acceleration due to gravity and the height of the liquid above the certain point. The standard unit for pressure is Pascal (Pa). Other units of pressure, such as pounds per square inch and bar, are also commonly used. The pressure units can also be expressed in grams-force or kilograms-force per square centimeter, without properly identifying the force units. The standard atmosphere (atm) is approximately equal to typical air pressure at earth mean sea level and is having the value of 101325 Pa. Since, Pressure is most prevalently measured by its tendency to displace a column of liquid in a manometer, it is also expressed as depth of a fluid. For example: Centimeters of water (or) millimeters of mercury.

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CPAP is the acronym for "Continuous Positive Airway Pressure". A CPAP device is used in respiratory therapy. Some ambulances carry a CPAP device. The pressure unit used in CPAP devices is "cm H2O". A typical pressure setting on a CPAP device may be 9 cm H2O. Blood pressure is commonly measured in units of mm Hg (or millimeters mercury). Which of the following statements is true regarding the pressure of 1 cm H2O ? Question 17 options: A) 1 in H2O has a lesser pressure than 1 cm H2O. B) 1 in H2O has a greater pressure than 1 cm H2O. C) 1 mm Hg has a lesser pressure than 1 cm H2O. D) None of the above answer choices are correct.

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