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Why do we need SI units?
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TN-06-Science
In this video, we will find the reason behind the need of a system of units.
Rashid and Rajat are 2 friends. Rajat Lives in Delhi and Rashid lives in Chennai. Both of them are student of grade 6 in CBSE board. On fine day, while discussing about books, they planed to find whether both of them have same science book. To find out, they came up with the plan to measure the length of the book using their hand span and compare the results.
Rajat measured the length of the book as 2 hand spans but Rashid measured it to be equals to 1.5 hand span. Based on this, they inferred that they are not being taught by same book. They went to their teachers to seek the explanation.
Teacher explained to Rajat that everyone has different hand size and thus size of hand span is also different. Rashid's hand must be bigger compared to yours and thus his measurement of book is less. He suggested him to use centimetre scale and compare the results.
Next day, Rajat again talked to Rashid and asked him to measure the length of the book using centimetre scale. Rajat also measured his science book using a centimetre scale. To their surprise, both of them measured the length equals to 30 centimetre.
Next day, Rajat again went to his teacher seeking explanation. Teacher explained that in old days, people faced similar problem. To solve this, they kept a definite length object in a safe place and distributed it's replica all over the world. Length of this object is known as 1 metre. When we say that a rope is 1 metre long, it means that it's length is same as the length of the object which is kept at the safe place. By doing so, they made length of 1 metre equal for all the person in the world irrespective of person's size and place.
Similarly they defined kilogram and seconds. They formed a system of units which can be used and understood by everyone in the world. This system is known as SI Unit system or International System of Units.
SI unit for measuring length is metre. For measuring weight, it is kilogram and For time, it is second.
By using multiples and sub multiples, other units such as kilometre, centimetre, millimetre, gram, tonne, minute, hour etc. are defined.
In this video, we will find the reason behind the need of a system of units.
Rashid and Rajat are 2 friends. Rajat Lives in Delhi and Rashid lives in Chennai. Both of them are student of grade 6 in CBSE board. On fine day, while discussing about books, they planed to find whether both of them have same science book. To find out, they came up with the plan to measure the length of the book using their hand span and compare the results.
Rajat measured the length of the book as 2 hand spans but Rashid measured it to be equals to 1.5 hand span. Based on this, they inferred that they are not being taught by same book. They went to their teachers to seek the explanation.
Teacher explained to Rajat that everyone has different hand size and thus size of hand span is also different. Rashid's hand must be bigger compared to yours and thus his measurement of book is less. He suggested him to use centimetre scale and compare the results.
Next day, Rajat again talked to Rashid and asked him to measure the length of the book using centimetre scale. Rajat also measured his science book using a centimetre scale. To their surprise, both of them measured the length equals to 30 centimetre.
Next day, Rajat again went to his teacher seeking explanation. Teacher explained that in old days, people faced similar problem. To solve this, they kept a definite length object in a safe place and distributed it's replica all over the world. Length of this object is known as 1 metre. When we say that a rope is 1 metre long, it means that it's length is same as the length of the object which is kept at the safe place. By doing so, they made length of 1 metre equal for all the person in the world irrespective of person's size and place.
Similarly they defined kilogram and seconds. They formed a system of units which can be used and understood by everyone in the world. This system is known as SI Unit system or International System of Units.
SI unit for measuring length is metre. For measuring weight, it is kilogram and For time, it is second.
By using multiples and sub multiples, other units such as kilometre, centimetre, millimetre, gram, tonne, minute, hour etc. are defined.
In this video, we will find the reason behind the need of a system of units.
Rashid and Rajat are 2 friends. Rajat Lives in Delhi and Rashid lives in Chennai. Both of them are student of grade 6 in CBSE board. On fine day, while discussing about books, they planed to find whether both of them have same science book. To find out, they came up with the plan to measure the length of the book using their hand span and compare the results.
Rajat measured the length of the book as 2 hand spans but Rashid measured it to be equals to 1.5 hand span. Based on this, they inferred that they are not being taught by same book. They went to their teachers to seek the explanation.
Teacher explained to Rajat that everyone has different hand size and thus size of hand span is also different. Rashid's hand must be bigger compared to yours and thus his measurement of book is less. He suggested him to use centimetre scale and compare the results.
Next day, Rajat again talked to Rashid and asked him to measure the length of the book using centimetre scale. Rajat also measured his science book using a centimetre scale. To their surprise, both of them measured the length equals to 30 centimetre.
Next day, Rajat again went to his teacher seeking explanation. Teacher explained that in old days, people faced similar problem. To solve this, they kept a definite length object in a safe place and distributed it's replica all over the world. Length of this object is known as 1 metre. When we say that a rope is 1 metre long, it means that it's length is same as the length of the object which is kept at the safe place. By doing so, they made length of 1 metre equal for all the person in the world irrespective of person's size and place.
Similarly they defined kilogram and seconds. They formed a system of units which can be used and understood by everyone in the world. This system is known as SI Unit system or International System of Units.
SI unit for measuring length is metre. For measuring weight, it is kilogram and For time, it is second.
By using multiples and sub multiples, other units such as kilometre, centimetre, millimetre, gram, tonne, minute, hour etc. are defined.
In this video, we will find the reason behind the need of a system of units.
Rashid and Rajat are 2 friends. Rajat Lives in Delhi and Rashid lives in Chennai. Both of them are student of grade 6 in CBSE board. On fine day, while discussing about books, they planed to find whether both of them have same science book. To find out, they came up with the plan to measure the length of the book using their hand span and compare the results.
Rajat measured the length of the book as 2 hand spans but Rashid measured it to be equals to 1.5 hand span. Based on this, they inferred that they are not being taught by same book. They went to their teachers to seek the explanation.
Teacher explained to Rajat that everyone has different hand size and thus size of hand span is also different. Rashid's hand must be bigger compared to yours and thus his measurement of book is less. He suggested him to use centimetre scale and compare the results.
Next day, Rajat again talked to Rashid and asked him to measure the length of the book using centimetre scale. Rajat also measured his science book using a centimetre scale. To their surprise, both of them measured the length equals to 30 centimetre.
Next day, Rajat again went to his teacher seeking explanation. Teacher explained that in old days, people faced similar problem. To solve this, they kept a definite length object in a safe place and distributed it's replica all over the world. Length of this object is known as 1 metre. When we say that a rope is 1 metre long, it means that it's length is same as the length of the object which is kept at the safe place. By doing so, they made length of 1 metre equal for all the person in the world irrespective of person's size and place.
Similarly they defined kilogram and seconds. They formed a system of units which can be used and understood by everyone in the world. This system is known as SI Unit system or International System of Units.
SI unit for measuring length is metre. For measuring weight, it is kilogram and For time, it is second.
By using multiples and sub multiples, other units such as kilometre, centimetre, millimetre, gram, tonne, minute, hour etc. are defined.
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