I presume you mean magnetism and buoyancy.
We should substitute lead (as is usual) for steel in order to eliminate magnetism and then take into account the buoyancy of the air.
In a vacuum, a kg of lead and a kg of feathers would weigh the same. In air the feathers, due to a larger buoyant force, would appear to weigh around 0.01N less.
There's a shipload of puns lurking here!
(A ship load is a UK unit of weight for coal equal to 430803.889 kg.)
I was glad to have you on board to help rock the boat, but now I fear this thread may be dead in the water!
As far as the defining the kilogram goes, that may be a weight of everyone's mind!
How many Avoirdupoids in a kilogram ? 
The Avoirdupoids is 0.45359237 kilogram
ROFL
Avoirdupois system - Wikipedia
The Avoirdupoids is 0.45359237 kilogram
ROFL Avoirdupois system - Wikipedia
Excellent! Just proves you're no dead weight when it comes to the art of scientific punning!
P.S. Tons deadweight is a measure of how much weight a ship can carry, not its weight empty. It is the sum of the weights of cargo, fuel, fresh water, ballast water, provisions, passengers, and crew.
But does the international pound equal 0.45359237 of the newly defined kilogram?
Yes, the joke.
Anyway, we all fail Physics class. A gram is not a measure of weight, it's mass.
How many Avoirdupoids in a kilogram ?
The Avoirdupoids is 0.45359237 kilogram
Avoirdupois system - Wikipedia
The bizarre thing is that the US refused the metric system for being 'too french' and so retained the medieval french Avoirdupois system to this day.
I've failed a few mathematics exams in my time, but see post #43 where I correctly use the newton (N) when referring to weight.
This is rocket science, man !I've failed a few mathematics exams in my time, but see post #43 where I correctly use the newton (N) when referring to weight.
A true story. The village idiot ( that was way back, when political correctness did not banned these men ) was giving services like fetching goods nearbys with a two wheel hand cart.
Some day, my grandfather was charged a higher fee. That was because "100 Kg of potatoes is much heavier than 100 Kg of coal".
Needless to say, he paid and did not try to explain. He was a teacher, kept trying to teach him, to read a clock, a couple of easy round hours, "quarter to" was hopeless.
SI is actually the official weights and measures system for trade of the United States, however it's not compulsory. Most packages will have the SI living right next to the Imperial. (see photo)
It is getting more common for SI to be used in schools, but again, it's not required.
Generally speaking it's becoming more and more common in use, particularly in manufacturing, as everybody else uses it.
A set of metric wrenches and spanners has been required to work on American cars since the 80's. (Although still, it's 1/2 Metric, 1/2 Imperial. Makes no sense, so I buy German cars...
)
A set of metric wrenches and spanners has been required to work on American cars since the 80's. (Although still, it's 1/2 Metric, 1/2 Imperial. Makes no sense, so I buy German cars...
I had a flat near home and needed AAA to unfreeze the bolts on my Saab. A year later I had a blowout in the middle of nowhere and the AAA guy that showed up didn't have a metric tire iron. It turned out that the first guy had stolen the one that came with the car.
I never trusted the flimsy wrench that comes with the spare tire, I don't even look at it. I keep in the trunk the X wrench that does 4 common metric tire bolts ( with true heavy duty jumper cables ).
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