physical quantities | SI units | base units | derived units | class 11 physics | physics ka safar
Physics ka Safar・14 minutes read
Physical quantities are measurable, base quantities like length, mass, and time, while emotions and feelings cannot be measured. The International System of Units (SI) standardizes units globally for measuring physical quantities, including base units like meter and kilogram, as discussed in the lecture.
Insights
- Emotions and feelings are not physical quantities and cannot be measured, unlike measurable physical quantities like length, mass, time, temperature, current, light intensity, and amount of substance which are base quantities in the International System of Units (SI) established in 1960.
- Base quantities are fundamental measurable qualities, while derivative quantities are derived from these base quantities using formulas. The process of measuring physical quantities involves choosing a standard, ensuring it is accessible and invariant, and understanding the magnitude and unit essential for accurate measurement, emphasizing the importance of standardization for global consistency in measurements.
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Recent questions
What are physical quantities?
Physical quantities are measurable attributes of objects or phenomena.
What are base quantities?
Base quantities are fundamental measurable attributes in physics.
What is the International System of Units (SI)?
The International System of Units (SI) is a globally recognized standard for measurement.
How are physical quantities measured?
Physical quantities are measured by comparing them to standard units.
What are derivative quantities?
Derivative quantities are derived from base quantities using formulas.
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Summary
00:00
"Measuring Physical Quantities: Base and Derivative"
- Physical quantities are all measurable quantities.
- Emotions and feelings are not physical quantities as they cannot be measured.
- There are two types of physical quantities: base quantities and derivative quantities.
- Base quantities are seven in number: length, mass, time, temperature, current, light intensity, and amount of substance.
- Derivative quantities are derived from base quantities using formulas.
- Steps to measure base quantities involve choosing a standard and a procedure of comparison.
- Ideal standards for measurement should be accessible and invariant.
- Magnitude and unit are essential for measuring physical quantities.
- The International System of Units (SI) was established in 1960 to standardize units globally.
- Base units in the SI system include meter, kilogram, second, Kelvin, ampere, candela, and mole.
17:45
Essential units for understanding physical quantities
- The lecture discussed various units of measurement including the work unit (joule), time unit (second), derivative unit (second square on kg meter square divided by second), power unit (second cube), pressure unit (Newton per meter square), and force unit (Newton). These units are essential for understanding physical quantities and will be used in future discussions.
