Green Bridge Learning Resource For Vapours

Overview

Welcome to the General Physics course overview focusing on the fascinating topic of Vapours. In this course, we will delve into the properties and behaviors of vapours, exploring concepts such as unsaturated and saturated vapours, the relationship between saturated vapour pressure (S.V.P) and boiling, methods for determining S.V.P, and the formation of atmospheric phenomena like dew, mist, fog, and rain.

Firstly, it is crucial to differentiate between saturated and unsaturated vapours. Saturated vapours are in equilibrium with their liquid phase, while unsaturated vapours have the potential to hold more substance in vapor form. Understanding this duality is pivotal in comprehending the dynamics of vapours.

Next, we will investigate the intimate connection between saturated vapour pressure and boiling point. Saturated vapour pressure is the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases at a given temperature. This pressure plays a pivotal role in determining the boiling point of a substance, a fundamental concept in the study of vapours.

One method we will explore in this course is the determination of saturated vapour pressure using the barometer tube method. This experimental technique allows us to quantify the S.V.P of a substance, providing valuable insights into its vapor phase behavior.

Furthermore, we will examine the formation of atmospheric phenomena such as dew, mist, fog, and rain. These natural occurrences are intricately linked to the behavior of vapours in the atmosphere, showcasing the dynamic interplay between temperature, humidity, and pressure.

As we progress, we will differentiate between dew point, humidity, and relative humidity, essential parameters in characterizing atmospheric moisture. Additionally, we will delve into hygrometry, exploring methods such as wet and dry bulb hygrometers for estimating the humidity of the atmosphere with precision.

In this course, we will engage in practical exercises and numerical problems to solidify our understanding of vapours and their intricate properties. By the end of this course, you will not only grasp the fundamentals of vapour behavior but also gain practical skills in applying theoretical concepts to real-world scenarios. Get ready to embark on a journey into the captivating realm of vapours in the realm of physics.

Objectives

Differentiate Between Dew Point, Humidity and Relative Humidity
Relate Saturated Vapour Pressure to Boiling Point
Distinguish Between Saturated and Unsaturated Vapours
Determine SVP by Barometer Tube Method
Estimate the Humidity of the Atmosphere Using Wet and Dry Bulb Hygrometers
Solve Numerical Problems

Lesson Note

The concept of *vapors* is crucial in understanding weather patterns, boiling points, and various physical phenomena. Vapors form when liquid molecules escape into the gas phase. This topic explores the interesting features of dew point, humidity, saturated vapors, and much more about the behavior of vapors in our atmosphere.

Lesson Evaluation

Congratulations on completing the lesson on Vapours. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.

You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.

Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.

What is the characteristic of unsaturated vapours? A. They are at equilibrium with the liquid phase B. They do not follow the ideal gas law C. They can be further compressed at constant temperature D. They have a fixed and definite volume Answer: They can be further compressed at constant temperature
How is the saturated vapor pressure related to the boiling point of a substance? A. They are not related B. They are indirectly proportional C. They are directly proportional D. Saturated vapor pressure is dependent on the molecular weight of the substance Answer: They are directly proportional
How can the saturated vapor pressure be determined using the barometer tube method? A. By measuring the volume of the liquid phase B. By measuring the temperature of the vapor phase C. By measuring the height of the mercury column in the barometer D. By measuring the mass of the substance Answer: By measuring the height of the mercury column in the barometer
Which of the following best describes dew point? A. The temperature at which air becomes saturated with water vapor B. The temperature at which water vapor condenses into liquid water C. The temperature at which clouds form D. The temperature at which fog disappears Answer: The temperature at which air becomes saturated with water vapor
How can humidity of the atmosphere be estimated using wet and dry bulb hygrometers? A. By measuring the temperature difference between the wet and dry bulb B. By measuring the pressure of the atmosphere C. By measuring the wind speed D. By measuring the humidity of the soil Answer: By measuring the temperature difference between the wet and dry bulb

Recommended Books

	Physics for Scientists and Engineers Subtitle Volume 1 Publisher Cengage Learning Year 2016 ISBN 978-130-110099-5
	University Physics with Modern Physics Subtitle 14th Edition Publisher Pearson Year 2015 ISBN 978-032-197361-0