The gravitational constant is an empirical physical constant involved in the calculation of the force of gravity, particularly its inverse-square law. In SI units, the gravitational constant is equal to 6.674×10-11 m3 kg-1 s-2. The gravitational constant is denoted by the letter G.

The gravitational constant is a key parameter in the mathematical description of the gravitational force. It appears in the inverse-square law of gravity, which states that the gravitational force between two masses is proportional to the inverse square of the distance between them. The constant is also involved in the calculation of the escape velocity from a planet or other body.

The value of the gravitational constant was first measured by Henry Cavendish in 1798. His value for G was 6.754×10-11 m3 kg-1 s-2, which is close to the currently accepted value. The uncertainty in Cavendish's value is estimated to be about 0.5%.

#### What is 9.

81 called? 9.81 is the standard acceleration due to gravity. It is defined as the acceleration of an object when it is falling freely near the surface of the Earth. The value of 9.81 is used in many calculations, including the calculation of air resistance.

### Why is G called a gravitational constant?

G is the gravitational constant because it is a physical constant that appears in the equation for the force of gravity. The force of gravity is given by the equation:

F = G * m1 * m2 / r^2

where m1 and m2 are the masses of the two objects, r is the distance between them, and G is the gravitational constant. What is relation between G and G? There is no direct relation between G and G. However, both are standards organizations that develop and maintain standards for information technology.

##### How fast is 1g?

There is no definitive answer to this question as it can vary depending on the context in which it is used. In general, however, 1g refers to the force of gravity that is exerted on an object. This force is typically measured in terms of acceleration, with 1g corresponding to an acceleration of 9.8 m/s2.

At what height gravity is zero? There is no definitive answer to this question as there is no agreed upon definition for "gravity" or "zero". However, some scientists and engineers might give a rough estimate of around 10,000 kilometers above the surface of the Earth, where the gravitational force is significantly weaker than it is at the surface.