Whois & Analysis for extraconversion.com

Wratten numbers are a labeling system for optical filters, usually for photographic use comprising a number sometimes followed by a letter.

The number denotes the color of the filter, but is arbitrary and does not encode any information (the 80A–80D are blue, the next filters in numerical order, 81A–81EF, are orange); letters increase with increasing strength.

Acceleration, in physics, is the rate of change of velocity of an object with respect to time.

An object's acceleration is the net result of any and all forces acting on the object, as described by Newton's Second Law.

The SI unit for acceleration is metre per second squared Accelerations are vector quantities (they have magnitude and direction) and add according to the parallelogram law.

As a vector, the calculated net force is equal to the product of the object's mass (a scalar quantity) and its acceleration.

Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.

Gauge pressure (also spelled gage pressure) is the pressure relative to the ambient pressure.

Volume is the quantity of three-dimensional space enclosed by a closed surface, for example, the space that a substance (solid, liquid, gas, or plasma) or shape occupies or contains.

A temperature is an objective comparative measurement of hot or cold.

It is measured by a thermometer.

Several scales and units exist for measuring temperature, the most common being Celsius (denoted °C; formerly called centigrade), Fahrenheit (denoted °F), and, especially in science, Kelvin (denoted K).