Those units which are independent with each other and can not be resolved into other units are called fundamental units. It is a metric system that multiplies and sub-multiplies can be expressed as powers of 10. Social Studies ; View All Subjects . Given, Diameter of the volleyball (d) = 80cmRadius of the volleyball (r) = \(\frac{80}{2}\) = 40cm = 0.4m Volume of the volleyball (V) = ?We know that, V = \(\frac{4}{3}\ \pi\ r^{3}\) = \(\frac{4}{3}\ \times\) \(\frac{22}{7}\) \(\times\) [ 0.4\(^3\) ] = \(\frac{5.632}{21}\) = 0.271 = 2,71 \(\times\) \(10^{-2}\) m\(^3\)Hence, the volume of the volleyball is 2,71 \(\times\) \(10^{-2}\) m\(^3\), A 22mm\(\times\) 155mm\(\times\) 10mm book weighs 1.25kg. These units are independent cannot be derived from other units. i. You can find us in almost every social media platforms. Those physical quantities, which depend on two or more fundamental quantities or power of fundamental quantity, are called derived quantities. Measurement is essential in selling and buying goods. Physics Class 9 Chapter 1 - Quantities and Measurement What is the knowledge called that is gained through observations and experimentations? Nepal bureau of weight and measure, check correctness of the scales and weight used by the general public in the market in every two years because the measuring device may lose their standard due to the regular use and other factors which may bring error in the measurement. Fundamental units =second. The significance of writing very big and small number in power of 10 is that it saves our time in calculations and helps to express the very large number in easy form. Subjects. It is required for the global understanding of the quantity of a substance. Here. We need measurement because of the following reasons: The quantity which can be measured directly or indirectly is known as physical quantity. According to definition of pressure, Pressure = Velocity = $\frac{\rm{Force}}{\rm{Area}}$ = mass * $\frac{\rm{acceleration}}{\rm{area}}$=$\frac{\rm{kgm}}{\rm{m^2s^2}}$=$\frac{\rm{kg}}{\rm{ms^2}}$. It gives one unit for one physical quantity. Its SI unit is second. So, in order to maintain the uniformity in measurement of physical quantities, the following standard units are used: State the relation between horsepower (hp) and watt(w). Fundamental unit: The units of the fundamental quantities are called fundamental unit. In Nepal, some people still use the local units like haat and mana for measurement of length and mass. Joule = kgm 2 /s 2. Unit is a quantity of constant magnitude which is used to measure the magnitudes of other quantities of the same manner. The duration between any two events is called time. Length is a fundamental quantity. Difference between fundamental and derived unit. The units of the fundamental quantities are called fundamental unit. Surface area of book = l * b =25 * 20 = 500 cm2, iii. The units which depend upon two or more fundamental units are called derived units. 0.000,000,0026, Express the following in power of 10. e.g kilogram , meter,  second  are the fundamental units. Measurement is the process of comparing a given physical quantity with a known standard quantity of the same nature. 14. 2,000,000,000, Solution : 2,000,000,000, = 2 x \(10^{9}\), Express the following in power of 10.(b). The units which are derived from the fundamental units are called derived units. 2 hours, 10 minutes and 40seconds= 2 x 60min+10min+40 s = 120 min + 10min+40 s = 130 x 60s + 40s= 7800 + 40 s = 7840 s = 7.84 x \(10^{3}\) s Hence, 2hr , 15 min and 30 sec equals 7.84 x \(10^{3}\) sec, Express the following in power of 10. 10,000,000,000,000,000, Solution:1 \(\times\) \(10^{16}\) = \(10^{16}\), Solution :1 \(\times\) 1. Watch Queue Queue 110 mg =110 * 10-3/1000=110 * 10-6 = 1.1 * 10-4 kg, 15litre = 15/1000=0.015m3 = 1.5 * 10-2 m3. The units of the fundamental quantities are called fundamental unit. It includes every relationship which established among the people. 2.3 \(\times\) 10\(\times\) \(^7\) \(\times\) 5 \(\times\) \(10^{-2}\), Solution: = 2.3 \(\times\)5 \(\times\) 10 \(^7\) \(\times\) \(10^{-2}\)= 1.15 \(\times\) \(10^{6}\). It is defined as the time taken cesium -133 atoms to make 9192631770 vibrations. The unit which does not depend upon other unit is known as basic unit. The measurement of unknown quantity can be done by comparing it with a standard quantity of the same kind. Measurement is the process of comparing unknown quantity with a known quantity.

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