Physical Quantities and Measurement || ICSE Class 6 PHY ch 2 || ICSE BYTES

Welcome to my youtube channel dedicated to ICSE students ! Here , i bring you concise and engaging videos that will make learning physics cup of everyones tea :)

Follow the ICSE BYTES channel on WhatsApp For Vdo Notes :
https://whatsapp.com/channel/0029VaU4...


Timestamps

0:00 Physical Quantities
0:40 Measurement
1:56 Magnitude and Unit
3:19 Choice of Unit
4:16 Three Systems of Unit
5:14 Basic Physical Quantities
6:50 Multiples and Submultiples
8:14 Convention while writing SI unit
11:11 Thankyou





Ignore Tags

#icseclass6th #icse #physics #icseboard
#class6 #physicalquantities #measurement
#chapter2 #icsephysics #class6physics #matter #icsephysics10 #unit #iitbombay #englishconversationpractice #english #hindi Ignore Tags
#matter #matterandsurroundings #icse #icseboard #icseclass6th #physicswallah #matterclass6 #selinaconcise #icsebytes #physicschapter1 #class6 #statesofmatter #compositionofmatter #class6 #compositionofmatter #icseclass10


Chapter 2 Physical Quantities and Measurements
Need of Measurement
Physical Quantities
Measurement
Types of physical quantities
Types of unit system
Measurement of length
Measurement of time
Measurement of temperature
Measurement of Area
Numerical related to physical quantities
Quantities that can be measured are known as physical quantities.
Measurement is the process of comparison of the magnitude of that quantity with a fixed
Unit of a physical quantity is a well defined standard in terms of which similar quantities can be measured.
Choice of unit
1. Convenient size i.e., the unit should neither be too small nor be too large
2. It should be well defined and easily accessible everywhere.
3. The value of unit should not change with space and time.
Unit which is independent of any other unit or which can neither be changed nor can be related to any other fundamental unit
Mass , length , time , temperature, current and amount of substance
Units are those which depend on the fundamental units or which can be expressed in terms of the fundamental.
Volume = l x l x l
Speed = distance/time
Density = mass/volume
C.G.S
L- centimetre(cm)
M – gram(g)
T – second(s)
F.P.S
L- foot(ft)
M – pound(lb)
T – second(s)
M.K.S
L- metre(m)
M – kilogram(kg)
T – second(s)
Conversions of different Units
10 mm = 1 cm
1 km = 1000 m
1 mg = 10 cg
1000 kg = 10 quintals
60 sec = 1 minute
365 days = 1 year
Convert 5m into cm?
Convert 2m into mm?
A light year is the distance travelled by light in vacuum, in one year.
Guidelines for writing the units
1. Symbols for units of quantities are written with a small letter e.g., m,kg,s
2. Symbol for a unit named after a scientist is to be written with capital letter e.g., K(Kelvin)
3. Symbols for any units are not to be followed by a full stop.
4. Symbols for any units are not written in plural forms. E.g., the symbol for 10 kilograms s 10 kg not 10 kgs
5. While writing a name for a unit, it should always be written in small letters.
Length can be considered as distance between two points.
Relation between different units of length
Devices used to measure the length
Measuring tape
2. Meter rod
3. Measuring scale
Measurement of length using a measuring scale
Mass is the measure of the quantity of matter contained in an object. Mass of an object is fixed and it does not change from place to place
Mass of an object is measured by comparing it with standard mass. The process is called weighing. And the standard mass used for comparison is called weight.
Types of balances
For measuring a mass of an object the object is placed on one pan( left side) and suitable standard weights are placed on the other pan( right side). The total of the standard weights placed on right side pan gives the mass of the given object.
Measurement of mass using electronic balance
Measurement of time
Time is the defined as the interval between two events occurring at given place
S.I unit of time – second (s)
Other units of time – minute, hour, day , etc
Measurement of time in olden days
Water clock , sundial clock, sand clock
Measurement of time in nowadays
Pendulum clock, Wall clock, stop watch, 24hr clcok
Measurement of temperature
Temperature of an object is the degree of hotness or coldness of that object.
SI unit of temperature - kelvin
Other units of temperature
Celsius ( degree Celsius )
Fahrenheit ( degree Fahrenheit )
Thermometer is a device used to measure temperature.
Types of Thermometers
Laboratory
Clinical
A common laboratory thermometer consists of a fine capillary tube of a glass having a uniform bore. At one end of the capillary tube, a thin glass bulb is provided. The bulb is filled with pure mercury. The other end of the capillary tube is sealed, after removing air from it. The capillary tube is protected by a thick glass tube called stem. Markings are made on stem called degrees.
Scales on Thermometers