10TH GRADE · SI AND MAGNITUDE SCALES
SI units and conversion
Basic units and conversions of length, area, volume, mass and time.
The entire theory of the lesson is collected here; you can read it without an account. In interactive mode, the same theory appears as cards, followed by questions. with checking the answer and task, and progress is saved.
Basic Concepts
International system of units
A consistent system of units for recording physical quantities through seven basic units and their derivatives.
SI is a common language of measurements: writing in standard units allows you to immediately substitute data into formulas and compare results.
Unit conversion
Replacing a unit of measurement with an equal value in another unit without changing the physical value.
For example, 1 m and 100 cm describe the same length. The number and unit change, but the physical quantity itself remains the same.
Physical quantities
Path
The length of the trajectory traversed by the body.
Unit: meter ·
Length
Linear size of a body or area of space.
Unit: meter ·
Time
Duration of movement or process.
Unit: second ·
Height
Vertical distance between levels.
Unit: meter ·
Mass
A measure of a body's inertia.
Unit: kilogram ·
Area
The size of the surface on which the force acts.
Unit: square meter ·
Volume
The space occupied by a body or substance.
Unit: cubic meter ·
Electric current
Charge passing through a cross-section of a conductor per unit time.
Unit: ampere ·
Wavelength
The distance between the nearest points of a wave in the same phase.
Unit: meter ·
Lesson formulas
SI Basic Mechanical Units
Mass is expressed in kilograms, length in meters, time in seconds, current in amperes.
Gram to kilograms
One gram is equal to one thousandth of a kilogram.
Centimeter to meters
One centimeter is equal to one hundredth of a meter.
Millimeter to meters
One millimeter is equal to one thousandth of a meter.
Square centimeter
One square centimeter is equal to one ten-thousandth of a square meter.
Square millimeter
One square millimeter is equal to one millionth of a square meter.
Cubic centimeter
One cubic centimeter is equal to one millionth of a cubic meter.
Liter to cubic meters
One liter is equal to one thousandth of a cubic meter.
Hour in seconds
One hour contains three thousand six hundred seconds.
Related formulas
The same formulas in the reference, with symbols and units.