# Physical Constants

#### Physical Constants in Astronomy

Synodic and Sidereal Periods of the planets

Synodic Period - Time that elapse between two successive identical configuratio as seen from Earth
Sidereal Period - True orbital period of a planet, the time it takes the planet to complete o...

#### Physical Constants in Mechanics

Densities of Common Substances

Deity is defined as mass divided by volume, or mass per unit volume. The deity in kilograms per cubic meter can be obtained by multiplying the table values by 1000.
The deities of most of the pure...

Viscosity of Liquids and Gases

Viscosity has the SI units Pascal seconds (Pa s) which is called the Poiseuille. More commonly used is the dyne sec/cm2 which is called Poise. One Pa s is 10 Poise. The Poise is used in the table bec...

Compressibility of Liquids

Compressibility is the fractional change in volume per unit increase in pressure. For each atmosphere increase in pressure, the volume of water would decrease 46.4 parts per million. The compressibili...

Physical Properties of Some Typical Liquids

Property
Argon
Benzene
Solid
Liquid
Solid
Liquid
Deity (kg/m3)
1636
1407
100...

Angular Speed of Earth

The average angular speed Wav is the average rate of change of the angular displacement.The Earth's angular velocity is cotant (or nearly cotant). Therefore we can calculate the average ang...

Moment of Inertia for Uniform Objects

Object
Axis of Rotation
Moment of Inertia
Solid Disk
Central axis of disk...

#### Physical Constants in Optics

Wavelength for the various colors

Approximate wavelength For the various colo
Color
Wavelength (nm)
Red
780 - 622
Red
780 - 622...

Index of Refraction

Refraction is the bending of a wave when it ente a medium where it's speed is different. The refraction of light when it passes from a fast medium to a slow medium bends the light ray toward the norm...