# ثابت الجاذبية

ثابت تناسبي γ في قانون نيوتن للجاذبية الكونية. يمكن أن ترتبط قوة الجاذبية F بين نقطتين للكتلة m1 و m2 بالمسافة r بينهما:

has the value . The force is a vector directed toward the attracting mass. The gravitational field *g* (also a vector, often called the **acceleration of gravity**) is the force per unit mass (measured by the force on the mass *m*_{1} in the gravimeter):

*g* is the vector sum of the effect of all the masses (e.g., the masses in the Earth).