Key weight: depends on the manufactorer of the car or house key. Did you mean key as in Kilo as in kilogram?
A rough guide is 2.2 lbs per kilo.
One kilogram is one thousand grams
One gram = 0.035273962 ounces
One pound = 16 ounces
One kilogram = 2.2046226 pounds http://www.onlineconversion.com/auto_convert.pl
30grams
.5 ounce
.5 ounces
3ounces
Weigh the key. With water, fill a graduated cylinder to a mark that is deep enough to cover the key. Now place the key in the water, and measure how much the water goes up. That will give you the volume of the key. Density is weight divided by volume.
density is mass per volume. First weigh (mass) the key, then to find it's volume, place it into a container with liquid and measure how much volume is displaced.
You would weigh about 1/6 as much on the moon as you weigh on earth if you were not wearing heavy equipment. I would weigh about 560 ounces on the moon.
it really depends. most seeds don't weigh much. however, some weigh a lot.
On Saturn, you'd weigh 97.75 pounds.
Depends on the size.
40g
3,846 pounds (SI Units)
0.5 oz
That depends on the size of the key and what it is made of.
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Weigh the key. With water, fill a graduated cylinder to a mark that is deep enough to cover the key. Now place the key in the water, and measure how much the water goes up. That will give you the volume of the key. Density is weight divided by volume.
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