What is mean by mass

the measure of the amount of matter a body contains ,is called mass.
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Our extra skin
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mass means weight or surface may be it is correct
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When a thing occupies space it calls it mass
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A large amount or number of something
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a large amount or number of something
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mass is the amount of matter present in a substance
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Accuracy and Approximation in Measurement

We very often are in a position where we have to measure something, for example, when want to know how far Delhi is from Mumbai, what is the length of the piece of cloth we have to buy to stitch a new shirt or even when we ask about how much time does it take to fly to Chennai from Mumbai. Have you ever thought how many times we use exact or accurate measurement for these purposes?


We need not be very accurate every time we take a measurement. The degrees of accuracy in measurements vary according to the situations. For example, when someone asks about the time of the day, we do not have to be specific up to the seconds of time, because there is no need to be that accurate in the given situation. On the other hand, for laboratory purposes or for scientific experiments, we have to measure the time even up to milliseconds accurately.

For this reason, while taking measurements, we should know how accurate measurement is required.

Sometimes we have to take a lot of observations in an experiment. For example, if we take one reading very accurately and others with a lesser degree of accuracy, then we will not obtain a very accurate result of the experiment. It is observed that the accuracy of an experiment is the same as the least accurate reading.


Did you notice that while preparing food, your mother does not require measuring the quantity of salt to be added into the food? Still you find the food to be very tasty. How is your mother so accurate every time?

The answer is that she has an estimation of how much salt is required for good taste. From this, we understand that any quick judgment about a measurement of a quantity is an?estimation.?We make these quick judgments by using our senses. Let us take some examples to understand this better.

When we feel cold, we slow down the speed of the fan. How do we know how much to slow the fan down? We use our senses for that.

When we take a sip of tea, we immediately come to know whether more sugar is required or not. We can even say how much sugar should be added to it.

Sometimes we estimate because we do not have any tool at that moment to take the desired measurement. However, primarily we do so because we do not require a tool to measure accurately in most cases or our quick judgment is satisfactory enough. Like any other skill, we can develop this skill and make it better by practising. Now you know how your mother prepares such great foods.

Have you ever observed variation in your body weight when measured with different machines?

Sometimes we encounter errors while measuring different physical quantities due to several reasons and few are listed here:

An error can occur when we are not using the appropriate device.There are observational errors during measurement i.e. when we do not handle the device properly.There may be some fluctuations in the temperature and voltage etc.


You should always know where to use an approximation in measuring. A little more salt in your food will have very little effect on the taste, but even a little bit of extra dose of medicine might harm you severely.


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CGS System: The base units for length, mass and time are centimetre, gram and second, respectively.MKS System: ?The base units for length, mass and time are?metre, kilogram and second, respectively.International Systems of Units:?It is a system?of units based on the seven fundamental units, known as System International(SI), widely used all over the world. It is also called?metric system.Find yourself:?
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