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English Guide: Practical Tips for Better English Communication

Avoid common English mistakes: How and when to use "one of", "some of" and "few of" One rule of English grammar that can confuse a new or amateur English speaker is the subject-noun difference. This shows mostly when you use phrases like ‘one of’, ‘some of’ or ‘few of’ in a sentence. If you think that all these phrases imply the same meaning, and can be used interchangeably, then that’s where you will be wrong. Knowing how to use a phrase correctly is what will help you be a flawless English speaker. Now these three phrases...
Difference between ‘how about’ and ‘what about’ and how to use it If you aren’t a native speaker, learning right English can be quite a task. The reason being, a lot of words and phrases we use are colloquial and don’t really adhere to the rules of English language. That is why the difference between how we use and understand certain phrases and why it would mean something entirely different to a native speaker. The biggest problem arises when we use certain words and phrases interchangeably. The most basic...
article thumbnail Idioms are a group of words whose meaning is different from the literal meaning.  Idioms are expression, a phrase. They have hidden meaning. For Example- “Kick the bucket”, it means to die. There are many other idioms too which are related to body. These are known as Body idioms.Some of the Body Idioms are:1. All ears:  full attentionExample- Her all ears were here when we were talking about that matter.Example- We should keep all our ears open while...
article thumbnail Most of us get confused between the usage of - I, me, mine and myself. Are you confused, what to use when? This blog will help clear your confusion.When to use I, me, mine and myself1. I and me‘I’ is used when you are referring to yourself. In this, you are the one who is performing the action.Example- I am going for the dance class with Shweta.Example- I submitted the project a little late.Me is used when someone else is going to perform a...
people waiting outside room In our busy work schedules, occasionally there arise situations where we have to keep people waiting for us. This situation, especially, when faced in an office environment, when you are busy with your work and someone requests you or your boss orders you to do something which is very urgent. So, at that time you have to speak to them politely and communicate that they have to wait for a while. These are the words which can help you.Words used to ask...
Difference between Sometimes,sometime and some time English is a language which sometimes has many confusions. There are some words with different meanings and different words with the same meanings. Example - smart, bright and intelligent or attractive, pretty and lovely. These words mean the same, right? Now we are going to look at words which are same but are used according to the situation or during a specific time.For Example -She looked around for some time.He sometimes comes here.I need sometime...
clarity Sometimes when we have a conversation with someone, we sway in our thoughts and tend to overlook what the other person just said.  This annoying situation can happen with anyone of us. But it is our duty to clarify the mistake or tell the person to repeat what he/she said. This situation can also be experienced by an employee during a meeting. In this particular blog, we would like to share some of the ways to ask for clarification. Words to be...
yes If suppose a person asks you, ‘Do you stay in Airoli?’, and if you need to say yes, you can say it in  different ways, something like, yes, you’re correct. This was just an example of how to say whether someone is right. There are some other ways or words you can use. 8 ways to say that whether someone is right 1. Yes that’s right - informal way of agreeing Example - Meena - I heard that you are shifting to Kerala? Is it? Reena- Yes that’s’...
sleeping Sleep is very important for our body. It keeps us fresh and energetic. Sometimes, when we do not get a good night’s sleep, we feel so irritated because our brain cannot function properly. And this may be a very common topic of discussion amongst our friends and parents and others too. So, here are some phrases which you can use.Phrases to discuss about sleep1. Tossing and turning: not being able to sleep properlyExample - Reena was tossing and turning...
Nice to Meet you As we all know, first impression is the last impression. Therefore, first impression should always be a positive and a good one, so that the person you are meeting feels good about you. There are some ways through which you can do this. Even in offices, when you have a meeting with your boss or with your clients there are some ways and manners which you need to follow. So, let us have look on interesting ways to say nice to meet you.Ways to say...
How to start Social Conversation in English at a party Have you ever been to a party where you do not know too many people? Or perhaps look back and recollect your first office party - where everyone around seemed to know everyone but YOU?  While some may have a natural flair for starting conversations in English with strangers or acquaintances, there are some others who feel out of place in such situations. This article shall quickly give you some valuable tips, to ensure that you can strike an...
spelling The ability to communicate our thoughts through words is a unique ability given to only one species on earth – human beings! A language allows us to express our mind and our feelings to another individual and “English” is the most universally accepted language. While we may pride ourselves on our English vocabulary skills, and believe that we rarely make mistakes in our written communication, it would still be a good idea to have a quick look at...
Reading News & articles There is no denying the fact that communication is a must for any kind of human interaction or collaborative efforts. The quality of your communication, however, be it written or spoken, depends on the strength of your vocabulary. Your ability to use the right words to convey exactly what you mean makes you a better communicator and holds you in good stead in general conversations.Here we shall look at a few tips that can help you improve your...
article thumbnail In our life, we all take decisions and make decisions on a daily basis. Some decisions are important that cannot be changed and some decisions can be changed according to the situation. There are some ways to  say that we have changed our decision. So let’s have a look:9 interesting phrases to express that you have changed your decision:1. I changed my mind: you had made a decision in past but you changed it.Example-  We decided to study...
make things happen In our life we all meet people who are little nervous, confused or who have lost hope in some or the other way. If you consider yourself as a true friend, you can help your dear ones by motivating them with your kind words. This can surely make a difference in their life.9 Phrases for motivationSo here are some phrases that you can use to motivate your dear ones.1. Give it a try: when someone is doing something for the first time but is...
extravagant Is your friend too extravagant? Did you understand the meaning of extravagant? No, right. It means a person who spends his/her money in a wasteful or careless way. There are many other words which can be used to describe a person who spends way too much money.9 words used to describe that you spend too much are:1. To splash out: to spend money on things which are not actually needed.Example- She is the one who always splashes out and then...
article thumbnail There are times when we get late for a meeting, or we miss our train or bus. These are all common situations which are faced by all. Sometimes you may get late because of your friend or because of someone else.  There is a certain way you can behave or communicate in these situations.  It is very important that you behave in a proper way so that you create a good impression of yourself on everyone.7 ways to say hurry up1. There’s no time to...
have a whale of time "This time she is going to hit the books”. Does that mean that she is going to beat a book? No, it means she is going to study hard this time. These sentences are known as idioms. Idioms are phrases which have a figurative or somewhat literal meaning They do not mean what exactly the words say. For Example- Best thing since slice bread – this means a new and a good invention. People also use idioms according to their moods like when they are...
article thumbnail Do you get confused between these words? They seem to be similar but they are used at different situations. For Example- The jeans which you bought for me yesterday from the market, is too loose. Do you think in this situation, the lose can be replaced with loose? No. So let us have a look at some more examples of the same kind and clear out our confusion between the uses of these words.Common mistakes to avoid between lose, loose, lost and...
thank you We all have certain people in our life to whom we are really thankful. It may be because they might have helped us or have been there when we needed their support.To show our courtesy, we must thank them in a good way. People give chocolates, gifts etc. to show the gratitude. The simplest form of expressing gratitude is by using the kind words. So, let us have a look at some of the best ways to thank someone. 8 Interesting ways to thank someone1....
sad baby In life, there are times when we feel low and upset. This situation comes when some unexpected things happen. We all, for sure, might have faced this kind of situation at least once in our lifetime. However, these things are very common and expressing them in English is not uncommon. In this blog, you will learn about some interesting slang words to express and describe disappointment.8 slang words to describe disappointment1. Bummer or Bummer...
Jam session In today’s competitive and busy world, it is not easy to get a job in an MNC company. As there are many candidates who apply on a daily basis, it becomes difficult for the HR to conduct the interviews. Hence, they conduct various rounds and the one who clears reaches the final round. These rounds include group discussions, written tests, and a JAM session. While you might be aware of tests and group discussions, JAM can be described as a short...
pronounce words English is the only language which is spoken widely all over the world as it can be easily learnt and understood. One of the old yet easiest way to learn English is by reading newspapers, books, novels etc. You might find range of vocabularies to learn. Pick up 10 new words and learn the meaning, spelling, pronunciation etc. Unfortunately, there are many words which are pronounced incorrectly. According to a recent research almost 82% of the people...
travel idiom An idiom is an expression, word or a phrase that has a figurative meaning. They don’t mean exactly what the word say. They have hidden meaning. Like for example, “it’s raining cats and dogs”. The sentence doesn’t mean the way it is said or written. However, the sentence means it is raining heavily. In this blog, we will discuss travel idioms.Travel Idioms one must know1. Asleep at the wheel: Not attentiveExamples:Yash scored less marks in the final exams because...
travel idiom In the previous blog, we explained some interesting travel idioms. In today’s blog, we will explain some more travel idioms that will help to improve English communication skills. Let us learn those travel idioms.8 Travel Idioms you must know1. Road rage: anger or violence towards other drivers.Examples:While returning from Pune, our driver had a road rage with the other driver.Earlier today a man was arrested for attacking a motorist in a road...

Kinetic Theory of Gases

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Introduction to Kinetic Theory of Gases

kinetictheoryofgases1A Scottish botanist, Robert Brown, first suggested that gases were in a state of random motion. His model of the physics of gases, which describes the behavior of an ideal gas, portrays them much like a group of billiard balls moving on a billiard table. He observed that pollen particles seem to jiggle about for no apparent reason.

We see the same thing when observing smoke particles under a microscope. The random jerky movement of the particles is called Brownian motion and is due to their continuous and random bombardment by air molecules. The work of Einstein, Maxwell, and Boltzmann gave us the kinetic theory, as we know it today.
 
Temperature and pressure are macroscopic properties of gases. These properties are related to molecular motion, which is a microscopic phenomenon. The kinetic theory of gases correlates macroscopic properties and microscopic phenomena. Kinetics means the study of motion, and in this case, the motion of gas molecules. 
 

Main Postulates of the Kinetic Molecular Theory of Gases:

  • A gas consists of very small microscopic particles called “molecules.” Depending on the nature of the gas, each gas molecule can consist of an atom or group of atoms. Molecules are in continuous motion. 
  • All the molecules of a gas are in a stable state and are considered identical. 
  • Any finite volume of a gas consists of a very large number of molecules. 
  • At S.T.P. there are 3 x 1025 molecules in a cubic meter. 
  • Compared to their own dimensions, the molecules are wide apart from each other. 
  • The diameter of a molecule is about 3 x 10-10 meters. 
  • Gas molecules move in straight lines in all possible directions (i.e., they randomly move) at various speeds. 
  • Gas molecules collide with each other and with the walls of containers. Their collisions are perfectly elastic in nature. 
  • When gas molecules collide with the walls of a container, they transfer their momentum, which appears as the pressure of gas. 
  • The molecules of an ideal gas exert no force of attraction or repulsion on one another except during collision. 
  • The average kinetic energy of gas molecules is directly proportional to absolute temperature. 
  • At a given temperature, the molecules of all gases have the same kinetic energy. 
  • Newtonian mechanics is applicable to molecular motion.

     

Temperature

The kinetic theory explains why temperature should be a measure of the average kinetic energy of molecules. According to the kinetic theory, any given molecule has a certain mass, m; a certain velocity, v; and a kinetic energy of 1/ 2 mv2. As we said, molecules in any system move at a wide variety of different velocities, but the average of these velocities reflects the total amount of energy in that system.
 
We know from experience that substances are solids at lower temperatures, while liquids and gases are substances at higher temperatures. This accords with our definition of temperature as average kinetic energy; because the molecules in gases and liquids have more freedom of movement, they have a higher average velocity.

 

Pressure

In the kinetic-molecular theory of gases, pressure is the force exerted against the wall of a container by the continual collision of molecules against it. In physics, pressure, P, is the measure of the force exerted over a certain area. We generally say that something exerts a lot of pressure on an object if it exerts a great amount of force on that object, and if that force is exerted over a small area. Mathematically:
 
kinetictheoryofgases2
Pressure is measured in units of pascals (Pa), where 1 Pa = 1 N/m2. 
Pressure comes into play whenever force is exerted on a certain area, but is a particularly important characteristic of gases. Molecules are assumed to rebound elastically, with no kinetic energy lost in perpendicular collision. Therefore, ∆v = v - (-v) = 2v (see figure below). If a molecule is moving perpendicular to a wall, then it will strike the opposite parallel wall, rebound, and return to strike the original wall again. If the length of the container or distance between the two walls is the path length l, then the time between two successive collisions on the same wall will be ∆t = 2l/v. Therefore, the continuous force that a molecule moving perpendicular to a wall exerts is:
kinetictheoryofgases3Change in momentum as a particle hits a wall

kinetictheoryofgases4
 
The molecules in a sample of gas are not, of course, all moving perpendicularly to a wall. However, the components of their actual movement can be imagined to be along the three mutually perpendicular x, y, and z axes. If the number of molecules moving randomly, N, is large, then on the average, one-third can be assumed to exert their force along each of the three perpendicular axes. The square of the average velocity along each axis, v2(x), v2(y), or v2(z), will then be one-third of the square of the average total velocity v2:
 
v2(x)= v2(y)= v2(z)= v2/3
 
The average or mean of the square of the total velocity can replace the square of the perpendicular velocity. Therefore, for a large number of molecules N
 
F= (N/3) mv2/l
 
Consequently, the pressure will be given by 
 kinetictheoryofgases5
(since P = F/A)

 
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