A  friend once asked me four questions as follows:
- What is the difference between mass and weight ?
- Do we weigh the same in all planetary bodies?
- Why do astronauts bounce up and down when they transverse on the moon?
- And is weight the same as density?
You will be surprised that some people are confused with these measurement terms and incorrectly interchange the usage of mass and weight and often times density in describing objects. Let answer……
1a. Mass is inertia (fundamental resistance of  any object to applied  external force) or measure of matter while weight is measure of matter under the influence of an external force mostly gravity.
1b. Mass is scalar quantity; it has magnitude or numerical value while weight is a vector quantity (magnitude and direction). Direction meaning up, down, north , south and west.
1c. Weight is measured as a function  amount of matter(mass) multiplied by the influence of gravity (accelerating gravitational  force).
1d. Mass is measured in kilograms, ponds, ounces or stones. Weight is measured in Newton or kilograms
1d. Mass has been  proven  due the presence of elementary, subatomic “God ” particles (Higgs bosons) whose  interactions in a web-like space-time matrix called Higgs Field produces mass  (Large-Hadron Collider-CERN Switzerland) which has been espoused by the Physics community.  Mass is a property of a particle not to travel at the speed of light subsequently subatomic particles travel near the speed of light with minute mass to create mass by proximal collision and “excited” interaction with the Higgs field.
2. The key is not confusing weight with mass. We weigh differently in every planetary body because of “g” which is acceleration due to gravity. Acceleration due gravity is not constant due to influences of the size of the planetary body and its proximity to the source of gravity. So the closer you are the source to gravity the heavier your weight. Mass is constant regardless of location (Moon,Los Angeles, Sun, asteroids or Earth) because it obeys the laws of conservation of matter as long as it is not altered. It is therefore expected we should weigh heavier as we move closer to the Sun since it is the source of gravity for our solar system or move to a larger planetary body e.g Jupiter.
3. Astronauts look like they bounce on the Moon because of “g”. “g” of Earth is higher than “g” of the Moon so we feel lighter on the Moon thereby having a “floating” walk on the Moon. It would take astronauts some time in order to get acclimated with the gravitational influence of the moon.
4. Density is amount of matter per unit measured space. So density is the mass divided volume of the object. Weight is a force but density is related to matters relation to its volume so it is a scalar quantity.
💡Cosmic Frame>>>∞ and beyond💡 