Weight and Mass

Weight and mass are two commonly misunderstood terms in fluid mechanics and mechanics. Weight is the measurement of the gravitational force on an object, while mass is the measurement of the amount of matter in an object.

Asked in Weight and Mass, Concrete and Cement

How much does reinforced concrete weigh per cubic yard?

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Normal weight concrete -- a mixture or sand, cement, and stone gravel -- has an accepted density of 145 pounds per cubic foot. Since there are 27 cubic feet per cubic yard, a cu.yd. weighs 3915 pounds, or almost two tons. Complicating your question is the word "reinforced." Reinforced concrete has steel bars in it, called rebar. Steel has a density of about 490 pounds per cubic foot, which is more than three times the density of concrete, so the generally accepted density of normally reinforced concrete is 150 pounds per cubic foot which results in a cubic yard weighing 4050 pounds, but this depends on the quantity and grade of the rebar used. (Ref. AISC Steel Construction Manual, 13th Ed. Page 17-24. Also older editions have this same information.) There is light weight concrete made with lighter weight substitutes such as vermiculite for the stone and sand. These can have weights from 85 pcf. Also, there are heavy weight concretes made with steel punchings or pieces of lead used to line rooms for x-ray machines or other radioactive sources. There is a Wikipedia article on rebar, if you're interested in looking it up.
Asked in Weight and Mass

What household item weighs 5 grams?

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an old nickel weighs 5 grams*
Asked in Weight and Mass

How much does gunpowder weigh?

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That depends entirely on how much of it you have.
Asked in Science, Units of Measure, Weight and Mass, Atomic Mass

What instrument measures mass?

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Traditionally a balance was used to measure mass. Objects of known or accepted mass was balanced against another object of unknown mass. When the balance was level the two pans had the same mass. The term balance or scales is still used even though there is no balance used. The scales were the pans that the objects sat on. Now electronic balances are used that gauge the mass of the objects. While you can measure mass with a spring loaded scale, it is less accurate than a balance as it relies on a spring loaded to a specific acceleration of gravity for any given mass. A change in altitude will change the results given on the scale, due to the actual change in gravitational force (it is small at only about 0.031% error for every kilometer increase in altitude)*. A balance would experience no such change as the mass of an unknown quantity is compared to the mass of a known quantity, thus negating any effects of gravity. Another instrument that measures mass is an inertial balance. An inertial balance doesn't require gravity to work, so it can be used in space. It measures the mass of an object by attaching it to a spring and seeing how it affects the spring's period of oscillation. Very tiny masses can be measured directly (using a "massometer"). But we normally use scales, which measure weight, which is directly proportional to mass (a property of matter equal to its resistance to a change in speed or direction of travel). The mass of an object is the same everywhere in the universe. Its weight, however, changes depending upon its location: a bowling ball has greater weight on the surface of the Earth than it does on the Moon. Great confusion arises when people interchange units of weight with units of mass. Scientists, particularly physicists, are very careful about not using the terms interchangeably, but regular folks have no choice for practical applications. For example, when you weigh a regulation ten-pin bowling ball, the scale will tell you it "weighs" between 4 and 7 (3.63 to 7.27 actually) kilograms, even though the kilogram is, technically speaking, a unit of mass, not weight. You can also measure the mass of an object using a scale, as long as you factor in the gravitational constant (G). For instance, in an environment with only 1/2 the gravity of That on earth, you would have to double the weight displayed on the scale to determine the actual mass. As an example, 10Kg of lead in a 0.5G environment would only "weigh" 5Kg on a scale...half as much as on earth, even though its mass is unchanged.
Asked in Weight and Mass

How many viss in 1 liter?

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How many viss for oil 1.8 Liter
Asked in Weight and Mass, Marijuana

How much does a quarter pound of weed weight on a scale?

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A quarter pound. It weighs the same as a quarter pound of butter. A quarter pound of anything weighs a quarter pound
Asked in Weight and Mass

How much does a butt weigh?

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Depends on the size of the butt.
Asked in Area, Volume, Weight and Mass

How do you convert 3118 square feet into tons?

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3118 square feet of what? You need to know the density aswell. You can't. square feet is a linear measurement and tons is a weight measurement
Asked in Weight and Mass

How much does ounce of crystal meth weigh?

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An ounce is an ounce. Doesn't matter what it is of.
Asked in Weight and Mass

How many grams equals 1 bhari or tola?

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It is equal to 11.664 grams approximately.
Asked in Volume, Weight and Mass

How much does 200 liters of water weigh?

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1 litre of water is about 2.2 lbs so 2.2 times 200 is about 440 lbs.
Asked in Weight and Mass

What weighs 400 pounds?

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On average a full-grown male lion can weigh 400 pounds.
Asked in American Cars, Oil and Oil Filters, Toyota RAV4, Weight and Mass

How much does 1 gallon of used motor oil weigh?

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1 Gallon of oil weighs 7.344 pounds. Used oil may weigh slightly more.
Asked in Units of Measure, Weight and Mass

How much does a half gallon weight?

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Half a gallon of milk? Used motor oil? Molten candle wax?
Asked in Weight and Mass

What household items weigh 1 kg?

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A textbook...but not spelling
Asked in Cooking Measurements, Weight and Mass

What common items weigh 100 grams?

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A US nickel weighs 5.0 grams, so 20 US nickels weigh 100 grams even.
Asked in Weight and Mass

What objects weigh 4 tons?

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Well, not an object but a blue whale calf weighs about 4 tons. 10 CVO Harley Davidson Road Kings. Female African Elephant. A bit over 2 1/2 pallets of standard red bricks. The larger of the stones used to build Stonehenge. Not combined but just one stone. 2 1995 Ford Explorer XLT , 4x4s (about 200 lbs over 4 tons) and the closest thing I could find is the World's largest chocolate Easter Egg.