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# Physics (Τα φυσικά) Physics is the science that studies phenomena and determines the laws that govern them through the scientific method. **Physical Quantities** A physical quantity is any property of a physical system that can be measured. It can be a fundamental or derived quantity. | Quant...

# Physics (Τα φυσικά) Physics is the science that studies phenomena and determines the laws that govern them through the scientific method. **Physical Quantities** A physical quantity is any property of a physical system that can be measured. It can be a fundamental or derived quantity. | Quantity | Unit | Symbol | |---|---|---| | Length | meter | m | | Time interval | second | s | | Mass | kilogram | kg | | Temperature | Kelvin | K | | Amount of substance | mole | mol | | Intensity of a light source| candela | cd | | Electric current | ampere | A | **Reference Materials** * 1 m = distance traveled by light in a vacuum in 1/299,792,458 of a second. * 1 s = time taken by 9,192,631,770 oscillations of the cesium-133 atom. * 1 kg = based on the Planck constant. **Derived quantities** * Surface area: $m^{2}$ * Volume: $m^{3}$ * Density: $\frac{mass}{volume}$ * Velocity: $\frac{length}{time}$