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
De
ity is defined as mass divided by volume, or mass per unit volume. The de
ity in kilograms per cubic meter can be obtained by multiplying the table values by 1000. The de
ities 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 De
ity (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 co
tant (or nearly co
tant). 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...