A simple method for estimating the molecular size of oleic acid. Oleic acid is a soapy liquid with large molecular size of the order of 10⁻⁹ m. We dissolve 1 cm³ of oleic acid in alcohol to make a solution of 20 cm³, Then we take 1 cm³ of this solution and dilute it to […]
Estimation Of Very Small Distances: Size Of A Molecule Read More »
(I) LASER Method The full form of LASER is light amplification by stimulation emission of radiation. The reflection method for measuring the distance of the moon is LASER method. Distance of the Moon from the Earth S = c×t/2 Where, c = Speed of light ( 3×10⁸ m/s), t = Time elapsed between the instants
The length may be defined as the distance of separation between two points in space. There are two methods for the measurement of length. 1. Direct Method In this method, measurement of length involves the uses of (I) Meter scale (From 10⁻³ m to 10² m). (II) Vernier callipers (Upto 10⁻⁴ m). (III) Screw gauge
For Length/Distance (I) Astronomical Unit It is the mean distance of the earth from the sun. 1 AU = 1.496×10¹¹ m (II) Light Year It is the distance travelled by light in vacuum in 1 year. 1 ly = 9.46×10¹⁵ m (III) Parallactic Second It is the distance at which an arc of length 1
The system of units which is accepted internationally for measurement is called international system of unit. The SI, with standard scheme of symbols, units and abbreviations was developed and recommended by General conference on weights and measures in 1971 for international uses in scientific, technical, industrial and commercial work. Some other common system of units
The standard amount of a physical quantity chosen to measure the physical quantity of the same kind is called a physical unit. The essential requirement of a physical unit are as- (I) It should be of suitable size. (II) It should be easily accessible. (III) It should not vary with time. (IV) It should be
All those quantities which can be measured directly or indirectly and in terms of which the law of Physics can be expressed are called physical quantities. Physical quantities can be further divided into two types. 1. Fundamental Quantities Those physical quantities which are independent of other physical quantities and are not defined in terms of
