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The terms "mass" and "weight" are used interchangeably in ordinary conversation, but the two words don't mean the same thing. The difference between mass and weight is that mass is the amount of matter in a material, while weight is a measure of how the force of gravity acts upon that mass.

You can think of weight as a function of an object's mass and the force, or acceleration, it experiences due to gravity.

• Mass is the measure of the amount of matter in a body. Mass is denoted using m or M.
• Weight is the measure of the amount of force acting on a mass due to the acceleration due to gravity. Weight usually is denoted by W.
• Weight is equal to mass multiplied by the acceleration of gravity (g).
  

$W = m * g$W=m?g

Comparing Mass and Weight

For the most part, when comparing mass and weight on Earth—without moving—the values for mass and weight are the same. If you change your location, and gravity changes as a result, mass will remain unchanged, but weight will not. For example, your body's mass is a set value, but your weight is different on the Moon compared with on Earth because of the change in gravity.

How Much Do You Weigh on Other Planets?

While a person's mass doesn't change elsewhere in the solar system, the acceleration due to gravity and weight varies dramatically. The calculation of gravity on other bodies, as on Earth, depends not just on mass but also on how far the "surface" is from the center of gravity. On Earth, for example, your weight is slightly lower on a mountaintop than at sea level. The effect becomes even more dramatic for large bodies, such as Jupiter. While the gravity exerted by Jupiter due to its mass is 316 times greater than that of Earth, you wouldn't weigh 316 times more because its "surface" (or the cloud level we call the surface) is so far out from the center.

Other celestial bodies have different values of gravity than Earth does. To get your weight, simply multiply by the appropriate number in the table below. For example, a 150-pound person would weigh 354 pounds on Jupiter, or 2.36 times their weight on Earth.

You may be surprised by your weight on other planets. It makes sense that a person would weigh about the same on Earth and Venus because the two planets are about the same size and mass.

However, it may seem odd that you'd actually weigh less on the gas giant Uranus. Additionally, your weight would be only slightly higher on Saturn or Neptune. Although Mercury is much smaller than Mars, your weight would be about the same. These discrepancies are all due to the differences in gravitational pull on the various celestial bodies.

The Sun, for example, is much more massive than any other body, yet you'd "only" weigh about 28 times more. Of course, you'd die on the Sun from the massive heat and other radiation, but even if it were cold, the intense gravity on a planet that size would be deadly.