Gray (Gy)

The Gray (Gy) is a unit of radiation dose that is frequently used in the field of medical physics. It is defined as the absorption of one joule of energy per kilogram of matter. The unit is named after British physicist Louis Harold Gray (1905-1965), who is credited with developing the concept of effective dose. … Read more

Angular acceleration (rotational acceleration)

Angular acceleration (rotational acceleration) refers to the change in rotational speed of an object over time. It is usually measured in radians per second squared (rad/s2). How do you find angular acceleration from rotation? Assuming that you are given the angular velocity of an object (in radians per second), you can find the angular acceleration … Read more


In physics, a force is any interaction that, when unopposed, will change the motion of an object. A force can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate. Force can also be described intuitively as a push or a pull. A … Read more

Luminous flux

Luminous flux is the measure of the perceived power of light. It is weighted by the sensitivity of the human eye to different wavelengths of light. The unit of measurement is the lumen. Is luminous flux the same as lumens? Luminous flux and lumens are not the same thing, but they are closely related. Luminous … Read more

Information Society

The information society is a society where the creation, distribution, use, and manipulation of information is a significant economic, political, and cultural activity. The information society is based on information and communication technologies (ICTs). The term information society is commonly used, but has no single definition. A number of organizations and groups have been working … Read more

Angular degree (deg or °)

An angular degree (deg or °) is a unit of angular measure equal to 1/360 of a full rotation, or 1/2 of a degree. It is commonly used in mathematical and scientific contexts, and is denoted by the symbol °. Is Theta or radians a degree? There is no definitive answer to this question as … Read more

Horsepower (hp)

The horsepower (hp) is a unit of measurement of power, or the rate at which work is done. In the International System of Units (SI), the unit of power is the watt (W), and 1 hp is equal to 746 watts. However, in mechanical engineering, the horsepower is often used as a unit of mechanical … Read more

Statcoulomb (statC)

A statcoulomb (abbreviated as statC) is a unit of electrical charge in the cgs system of units. It is equal to the charge of 1 statcoulomb of charge. One statcoulomb is equal to the charge of 6.241 × 10^18 electrons. What is the difference between statcoulomb and coulomb? According to the International System of Units … Read more


A mole is a unit of measurement in the International System of Units (SI). The mole is defined as the amount of a substance that contains as many elementary entities as there are atoms in 0.012 kilogram of carbon-12. This number is called Avogadro’s constant. The mole is used in chemistry to express amounts of … Read more

ISO 14000 and 14001

ISO 14000 is a family of standards that provides guidance on environmental management. The standards are designed to help organizations minimize their environmental impact, comply with environmental regulations, and improve their environmental performance. ISO 14001 is the most widely-recognized standard in the ISO 14000 family. It provides guidance on how to develop and implement an … Read more