## The Difference Between Mass & Weight

I told Killian out to be back I wouldn't

want to be a liar

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one of the most misconceptions and

mistakes in physics is to confuse mass

and weight the two are absolutely not to

be confused but after watching this

video you'll never confuse the two again

first of all the reason a lot of us mix

between the two is probably because we

use the unit of mass to measure weights

in our daily life for example if I weigh

75 kilograms when I step on a scale I'd

say I weigh 75 kilograms and that is my

weight and notice the language here way

suggests that we're talking about weight

then you go to physics class and you get

told that kilograms are the unit to

measure masses and that is true so what

is the difference between the two let's

start by saying what mass really is now

mass is the amount of matter in an

object or a body it's the quantity of

matter in something this little building

blocks that make an object how much of

that is in it quite literally your mass

is how much of you is in you now the

mass does not change and is always the

same weight on the other hand is

actually a force and it is the force

that gravity does on the masses when we

stand on the earth the gravity gives our

mass its weight the fact that we exists

in a gravity field causes us to have a

weight

now mass is always the same and it

doesn't change but weight can change

depending on the gravity field for

example things weigh less on the moon

than on the earth because the moon has

smaller gravity than the earth but the

mass is actually the same in this

example the fact that I weigh less on

the moon doesn't mean that I am

physically smaller on the moon my mass

stayed the same but because the gravity

change my weight changed if I am a

really fat person and I go to the moon I

would weigh less but this does not mean

that I am less fat because I haven't

changed I just changed planets I know I

know the moon is not a planet anyway the

statement that I want you to remember is

that the force that is done on a mass

does not change how much the mass is now

let's take a look at an example and an

analogy that's going to explain that

much better and just help us visualize

this concept that I'm trying to explain

here this is an ice cube and we know

that water or an ice cube is made out of

molecules and the molecule is two

hydrogen and one oxygen that's h2o now

for the sake of the explanation let's

just say that this ice cube has a

hundred molecules of h2o a hundred

exactly a hundred in it right now that's

gonna represent its mass if I take my

finger and I push it like this to one

side or the other what I essentially did

is I applied an external force moving it

from one side to the other now this does

not change the fact that this has a

hundred molecules of h2o like we said

earlier because it's just a force that's

applied to it evidently there is always

a force that's applied to it and that is

the force of course of gravity so the

force whether it's my finger or gravity

downwards does not change the mass the

mass is simply how much h2o is inside

this ice cube and that's always the same

of course provided that it doesn't melt

but this is just for the sake of the

explanation and there's always a

download for status for gravity and this

force of gravity that's acting on the

mass is the weight

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you