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“Subscribe to ekeeda channel. And press bell icon to get updates about latest engineering hsc hsc and iit jee mains and advanced. Videoshello friends in this video. We will study what is measurement so let us start with our topic.
The word measurement. It tencel s about property of something means. The measurement. It is that how long an object is how heavy it is or how much it can hold so in simple definition.
If we define measurement. Then we can say that measurement tells us about the property of something so the measurement it gives us a means to describe the various phenomena occurring in nature in terms of quantity in nature. There are innumerable things and the measurement. It tells us that what is the quantity of those things okay like if we want to find out the length of a scale.
So how much length or how long that scale is that is the order measurement. There is a famous code that whatever exists in nature. It exists in some amount okay whatever like if air is present in the atmosphere. There is some amount of that air if water is present in the sea.
Then there is a amount of that water so whatever exists in nature. It eggs. It has some amount and the measurement or the amount or the calculation of that amount is called the measurement. Okay so that is the simple definition or in simple terms.
How we can define the measurement. Also measurements is the process by which one can convert the physical parameters to meaningful numbers means if we want to find out that how much water is contained in a glass. So we can roughly define it like it is approximately equal to means the amount of or equal to the weight of something or we can just give an idea that this much water is given so this is just an approximation. If we want to actually find out that how much water is contained in the gas.
We will say that suppose 200 ml of water is there so this 200 ml. The quantity which we are getting that this much amount of water is contained that is called the measurement. When we are measuring that water so we are converting the physical parameters into some meaningful numbers through the measurement. Okay now the measurements.
They are always performed with the help of using some instrument or some tool for example like rulers. Stopwatches thermometers. Weighing..
Machine. These all are the measuring instruments. Because like with the help of ruler. We can find out the length of a paper or anything or with the help of a machine.
We can calculate or we can measure the weight with the help of thermometer. We can measure the temperature with the help of stopwatch or watches. We can measure the time so all these instruments. They are used to measure some quantity okay so these instruments.
Which are used for measurement. They are called the measuring instrument. So we can say that measurement is always performed by using some kind of instrument or some tool you so the measurement. It is performed by using the instrument and the instrument.
Which is used to for doing the measurements that instrument is called a measuring instrument. An example of measuring instruments are ruler stopwatch for mojito weighing machine all these are a type of measuring instruments okay now as i told that measurement tells us about the property of something okay like if we talk about an object. So measurement will tell us that how long that object is how heavy that object is or how much that object can hold so it is telling about us about the length about the weights. And about the volume of that object okay so what the measurement is doing if we are telling that this scale is 30 centimeter in length.
So it is giving a number to that property okay. If we are telling that what is the length length is the property of the ruler. So we are giving a number that this length of the ruler. Is 30.
Centimeter okay. So measurement gives a number to that property now every time whenever we are doing any type of measurement. We will have some result of that measurement means if we are measuring and a property using a measuring instrument. Then that measuring instrument will give us the result so whenever we are expressing the result of the measurement.
It will contain two parts one is the number and second is the unit of measurement so every time the result of the measurement. It will consist of two parts. One is the number and second is the unit of measurement. Now let s take an example.
Suppose we want to measure the distance between two drinks okay and suppose this distance between the two trees. It is coming out to be two meters okay. So this two two is the number and meters is the unit and what we are measuring..
We are measuring the distance between the two trees so distance becomes the property which we are measuring and this property. We are defining that the distance is two meters between the two trees so the result of this measurement. It is having two parts one is the number that is two they are giving a numerical value to the result and also the unit of measurement. If we simply write that the distance between the two trees is two we don t write the unit.
So the two number it doesn t gives any specification that what is the value of this two is having no value okay so this unit. It gives unit is also given with this result that the distance between the two trees is two units okay because without this unit of measurement. This numerical value to it is of no use okay now this was what we defined the measurements in our simple way okay now let s come define the measurement in terms of engineering. Okay in engineering.
The measurement is defined as the process you so if in terms of engineering. If we define measurement then measurement is the art or the results of a quantitative comparison between the quantity whose magnitude is unknown and a predefined standard. So in measurement. What we are doing we are comparing two quantities.
The both amount of one quantities unknown to us okay and the amount of another quantity is known to us. So the quantity whose amount. We already know that is called a predefined standard and the quantity whose amount we want to know or the unknown quantity. The unknown.
Magnitude that is called the measure end okay so your in this definition. We have two things. One is the measured whose value we want to measure and another is the standard whose value we already know okay so unknown quantity. You here in this definition.
The quantity whose magnitude is unknown is called the measure or we can define mentioned as the physical parameter of variable to be measure and if you want to define the standard. So standard is defined as the quantity of the same kind mean same kind like measured. If you want to measure the length okay so unknown quantity is like the length of the ruler. If you want to measure the length of the paper.
We want to measure okay and predefined standard is the length of the ruler. We already know that the length of the ruler is 30 centimeter. So we are using that length of the ruler and that is our standard. Which is the quantity of the same kind we are measuring length so both standard and measurement measured.
It has to be the length. And it is chosen as a unit or basis for comparison of the quantitative value to be measure that is the measuring so measurement in the terms of engineering. We always define it as the result of a quantitative comparison between an unknown quantity and a known quantity unknown quantity is called the measure and know quantities for the standard now let s take another example..
Suppose we are measuring on unknown mass with the help of a known mass of 1 kg. We are using a weighing machine a weighing balance. We are using on one side. We keep the 1 kg of the mass which we already know and on the other balance on the other side of the balance.
We are keeping that unknown mass. Okay now when the balance is equal means when the balancing machine. It is equal it means that the unknown quantity. It is also of the same mass as that of one teaching.
So what we are doing. 1 kg is our standard ok. We are using that standard. We are making the comparison.
When the weighing machine is at equal when the balancing machine is balanced. It means the weight on both the sides is equal okay. So that unknown value is also having the same mass. So this is a type of measurement here the unknown mass is the measurement the 1kg of mass.
It is the standard and the weighing machine which we are music it is the measuring instrument okay now here i told that whenever we express the result of the measurement. We always express it in terms of a numerical value okay we give a number to that result and also a unit of measurement now in order that the result of the measurements. They should be accurate and perfect. There are three requirements so let s see what are the three requirements of it so.
The requirements are the first requirement is that the standard which we are using for the comparison purpose that standard should be accurately known and should be commonly acceptable by all okay. It means that suppose in the case in the earlier example which we take in where we are measuring the weight of an unknown quantity by comparing it with the 1 kg or first standard okay so here that standard quantity. It should be accurate. We the weight of that standard quantity.
It should be exactly 1 kg. Then only we can use it for the comparison purpose. If it is of suppose like 98 or 99. Kg.
Then we cannot use for it for the comparison that in that case. It would not be taken as a standard. Okay..
So standard. It should be accurate and also it should be commonly acceptable like if we are using a weight. So that weight could be taken as standard by all the persons who are doing the measurement. Okay.
The second requirement is that the standard must be of the same character as the measuring. Suppose we are measuring the length. Okay so we can take the ruler as the standard okay now in the case of measuring length. We cannot take the 1 kg mass of a quantity as a standard because we are measuring length.
Okay. We are not measuring the mass of the quantity. So the standard should also be of the same character as the measuring if they are measuring length. Then standard should also be the length okay if the imagining mass.
Then the standard should also be the mass. It should be compared with the mass of a quantity. Only now third requirement is that you the apparatus or the method. Which we are using for the comparison purpose that method and the apparatus.
It should be provable okay we can prove means it can exist in real that method and the apparatus. Okay the palatal should also be accurate then only the measurement. Results. They will be accurate so these are the three requirements in order to get the results of the measurement as some meaningful result okay so in this video.
We studied that what is measurement. How we can define the measurement in a simple language. That measurement tells about the property of something it tells a part or it gives a meaningful number to a quantity or to a physical parameter then we define the measurement in terms of engineering. That in engineering.
The measurement is defined as the result of a comparison between an unknown quantity and a known quantity. Then we define two terms the standard and the measuring and in the last. We studied that what are the three requirements. Which are essential for getting a meaningful result of the measurement.
So i hope that this topic. What is measurement is clear to you ” ..
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