Gram per watt

Opm

Active Member
Except, he asked ho much weight if he gets a gram per watt. He didn't say "How many pounds is 400g?", or something similar.
Weight implies pounds.
Metric goes by mass.

A gram of bud is the same in zero G or 1G.
 

kpmarine

Well-Known Member
Weight implies pounds.
Metric goes by mass.

A gram of bud is the same in zero G or 1G.
Weight is a means of determining quantities of mass. If you measure it on a scale, it's a weight. Put 1g of bud on a scale in zero gravity, it will weigh 0g, I'd bet you my bottom dollar. You're thinking of liters, a liter of bud is the same in zero gravity as it is in 1G.
 

cannabineer

Ursus marijanus
Weight is a means of determining quantities of mass. If you measure it on a scale, it's a weight. Put 1g of bud on a scale in zero gravity, it will weigh 0g, I'd bet you my bottom dollar. You're thinking of liters, a liter of bud is the same in zero gravity as it is in 1G.
Opm is partially right. Pounds are a measure of force while grams measure mass. Americans use pounds for mass as well, but that is an informal convention. Using metric mass for weight is a convention that works, but it's technically not right. Similarly in orbit I'd mass 90 kilos but weigh zip. cn
 

Gastanker

Well-Known Member
Hehe, I had to giggle at the pounds = weight and metric goes by mass.

***^ or did I just stick my foot in my mouth?

**** ouch, I did.

Although most gram and kilogram measurements are not true measurements of mass but instead it's gram or kilogram-force (kgf). Most drug dealer use scales ;)
 

kpmarine

Well-Known Member
Opm is partially right. Pounds are a measure of force while grams measure mass. Americans use pounds for mass as well, but that is an informal convention. Using metric mass for weight is a convention that works, but it's technically not right. Similarly in orbit I'd mass 90 kilos but weigh zip. cn
Could you explain to me how that is possible? How do you tell something weighs 90 kilos? In space I mean?
 

Gastanker

Well-Known Member
Could you explain to me how that is possible? How do you tell something weighs 90 kilos? In space I mean?
In space he would have a mass of 90 kg, not a weight of 90kg. Like he says kg is a measure of mass - essentially the total of the # of atoms of the various elements you are comprised of. It doesn't change in space.

But generally when people refer to kg they are referring to kgf which is weight, not mass.
 

cannabineer

Ursus marijanus
Could you explain to me how that is possible? How do you tell something weighs 90 kilos? In space I mean?
That's why I was careful and said that I mass 90 kilos. Scales are force-measuring devices, as Gastanker has mentioned. They're useful on Earth because the gravitational force is essentially a constant. (It would be cool to weigh something in Oslo and Mexico City: same mass but a 0.4% diff in weight...) To estimate mass in space, some other measuring device that directly quantifies inertial mass would be needed. A useful way of "weighing" spacecraft is to measure the acceleration produced by a constant force, say from a thruster of known force.
 

kpmarine

Well-Known Member
Ah, yeah, I see. It's both, technically. Either way though, I must now maintain that opm was talking nonsense then. By that, I mean his statement was in no way relevant to anything. For the purposes of weed, a Kg can be converted into pounds; making it weight.
 

kpmarine

Well-Known Member
That's why I was careful and said that I mass 90 kilos. Scales are force-measuring devices, as Gastanker has mentioned. They're useful on Earth because the gravitational force is essentially a constant. (It would be cool to weigh something in Oslo and Mexico City: same mass but a 0.4% diff in weight...) To estimate mass in space, some other measuring device that directly quantifies inertial mass would be needed. A useful way of "weighing" spacecraft is to measure the acceleration produced by a constant force, say from a thruster of known force.
Yeah, it clicked after gastanker said what he did. For some reason, my brain refused to comprehend for a second.
 

potroastV2

Well-Known Member
All of this physical science talk, and you guys haven't corrected the guy who says a pound is 448 grams.


A pound is 454 grams.


:mrgreen:
 

Opm

Active Member
Ah, yeah, I see. It's both, technically. Either way though, I must now maintain that opm was talking nonsense then. By that, I mean his statement was in no way relevant to anything. For the purposes of weed, a Kg can be converted into pounds; making it weight.
Technically, the only reason we use scales to determine mass is because it is the easiest method. Counting all the atoms and multiplying them by avagadro's number is not so fun.
As for relevance, You learned something new and isn't this forum for learning?
 

Kush2180

Active Member
Opm is partially right. Pounds are a measure of force while grams measure mass. Americans use pounds for mass as well, but that is an informal convention. Using metric mass for weight is a convention that works, but it's technically not right. Similarly in orbit I'd mass 90 kilos but weigh zip. cn

Ft. Pounds is a measurement of force and Pounds is a measurement of weight
 
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