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However, in recognition of this distinction is that, historically, a lot of development is a relatively recent situations in everyday language "weight", and continue to be used when the "mass". For example, we say, the objects ", weighs 1 kilogram of" No per kilogram is a unit of mass. The difference between mass and weight is negligible for many practical purposes, a reasonable approximation of the force of gravity is the same everywhere on the Earth's surface. This constant gravitational field, the strength of gravity of the object (weight) is directly proportional to the mass. So, if the weight of the object, say, 10 times more than the B object, the object in a mass 10 times that the B to object, object to the masses can be measured indirectly, by weight (see formula conversion). For example, when we buy a bag of sugar weight can be measured (or how hard to press down on the scale) and make sure it's a good sign to the amount of interest we have in fact, it is a large amount of sugar in the bag. Despite minor changes in the Earth's gravitational field is present (see Earth's gravity, please). These changes the relationship between weight and mass, must be considered a high-precision mass measurements of weight steps to be indirect. Most of the current research and the volume is measured in SI. In SI mass unit (and therefore the weight of some of the everyday sense) [3] is a kilogram. SI is a unit of force (and hence, a sense of the dynamics of weight), (o) Newton - can be represented in the city as a base unit kg m / s ² (kilo-meter times per second squared). I exercise gravity proportional to the mass of an object facility, and I think fairly, so that the strength of the gravitational force per unit mass measured in terms of power, that is, Newtons per kilogram (Net / kg). Nevertheless, none of the unit / kg decide m / s ² (meters per second per second), which is a unit of acceleration SI, and quotes from the usual practice for the strength of the gravitational acceleration. The American practice unit, the pound could either force the unit to unit mass. Linked with a number of different units in a separate unit and subsystems include slugs poundal. Poundal defined in the force must be accelerated to an object, pound-feet / s ² weight, and is equivalent to approximately 1 / 32 pound (power). In the slag is defined as the amount of mass is accelerating, 1 ft / sec ² weight when strength of the pound, and the equivalent of about 32 pounds (mass). Forced to weight, our sense of gravity is not a reduction, but also conventional forces (increasing contact force), on the surface及ぼさembark upon us, we are opposed to this, since the fall of gravity and center of the Earth. Regular forces, known as the apparent weight and one for the spring is measured on a scale. In order to support the body, still in a state of the normal balance of the earth's gravitational force is now obvious is the same size and weight, and actual weight. (Strictly speaking, this is a bit more complicated. example, the weight of the object in the water immersion渍少according to the scale in the spring time in the air than the same facility; This is due to buoyancy, which compared with the weight and power to create these and other factors typically small, further explanation for the apparent under the weight.) if there is no contact of any surface submit opposing forces then there is no sense of weight (weight not visible). This is a free drop, as an experienced sky-diver (terminal until their approach speed), the astronauts are in orbit, people feel "weightlessness", in spite of his body is still subject to gravity: They did not, however, resist it. There was no apparent experience in weight is also known as microgravity. It seems that weight loss occurs, for example, the elevator. Lift registered in the spring weight reduction of the person (apparently) downward acceleration of the elevator begins. This opposition in the elevator floor may abandon the accelerated under my feet. Weight measurements are typically two ways, using one. Spring size and weight scale hydraulic or pneumatic power-up (including the weight of apparent power) directly. If measuring the mass and weight, rather than a goal, and this power must be converted to mass. As mentioned above, the calculation is dependent on the force of gravity. Household and other low-precision scales are calibrated in units of mass (kg), almost normal gravity to apply. But despite almost constant is the actual and apparent gravity is actually quite different from slightly different places on the planet (see Standard gravity Physical Geodesy, gravity and gravity anomalies). This is the same object (the same weight), has a slightly different weight number of different locations. High-precision mass measurements must be spring scales depending on their intended location on earth, especially calibrated. Massa also can be measured on a balance of other items to compare a known mass. Regardless of this comparison is a valid local strength of the gravitational force. If the force, but the weight, mass, it is necessary, it can be calculated by multiplying the mass gravitational acceleration - either gravity (for the daily work), and the accuracy of the local gravity (the accuracy of the work). The total mass, as a rule, the term is found in trade and commerce applications, as well as the grave refers to the total weight of the product and its packaging. In contrast, the net weight of the product itself is a unique weight, and other discount the weight of packaging materials.