بار (Weight) is a measure of the force exerted by gravity on an object. It is commonly expressed in units such as kilograms or pounds. The weight of an object can change depending on the gravitational pull of the planet or celestial body it is on. For example, an object weighs less on the Moon than on Earth due to the Moon's weaker gravity. Weight is different from mass, which is the amount of matter in an object and remains constant regardless of location. To calculate weight, you can use the formula: Weight = Mass × Gravitational Acceleration. This relationship helps in understanding how objects behave under different gravitational conditions.