uni freshman here, hello guys. Im hopping im on the right forum for the silly question im bout to ask in regarding to my confusion about selfweight formulas.
i been told that self weight is = mass*gravity, ok so far.
The more i watch videos and read i seem to get confused in other ways to calculating selfweight. for example, if have density and not mass.
i see people dong this
density * volume = weight.
i scratch my head and thinking, isnt that a mass? im looking for selfweight of structure member in kN. For me, to get it in kN, must i multiply by gravity?
i see a lot video on youtube calculating selfweight of a slab like this
2500kg/m^3 * Volume of slab.
if selfweight is mass * Gravity, why the above example isnt multiplied by the gravity then if density * volume = mass, shouldnt the mass then multiplied by gravity?
Another thing that confuses the life out of me is the unit weight business. the 2500kg/m^3 is the unit of density, but i hear 'unit weight' in videos. And, when i do example question sometime im given unit weight in kN/m^2.
so what is it?
my understand is that if im given unitweight in kN, no need to multiply with gravity, except i have to watch out if is in kN/m^2 ill need to multiply by length. is this thinking correct?
Clarification will be helpful, especially with just finding selfweight with only density and volume. Any good source of material where i can read more will be helpful too. Thank you,
Uni Freshman.
