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But here we have a little paperclip 'floating' happily like a water bug on a solid rug. Download an mp4 [22 MB] version of this video.
Fill a glass with water and grab a few steel paperclips. It won't surprise anyone to 'discover' that paperclips don't float in water. That's because the density of steel is approximately kilograms per cubic metre. The density of water is kilograms per cubic metre.
To make a paperclip 'float', bend one arm of a paperclip in half like this. Lay a second paperclip horizontally on top of the one you bent in half like this. Gently lower your paperclip into the water. Hey presto, your paperclip is 'floating! To prove your paperclip isn't really floating at all, dip a toothpick in some dishwashing detergent.
Touch the surface of the water with your toothpick and your paperclip will probably continue to float. Now touch the bit of water bulging up on the 'inside' of your paperclip and you'll instantly sink your paperclip ship.
This classic science trick appears to defy Archimedes' Principle. But your paperclip is not really 'floating' any more than it would be if you had frozen the water and laid it on top. Resting on ice is not floating and neither is this. True floating, the Archimedean way, happens when an object displaces a volume of water that weighs more than the object itself.
When an object weighs more than the volume of water it displaces, it sinks. When an object weighs precisely the same as the volume of water it displaces, it neither sinks nor floats and is neutrally buoyant.
The density of steel is approximately kilograms per cubic metre, which is eight times greater than the density of water. Therefore, steel should definitely sink. The reason paperclips can be made to 'float' is because of their size and water's incredibly strong surface tension. Surface tension is measured in Newtons per metre and results from the force of attraction between the molecules in a liquid.
The more a strongly the molecules are attracted to each other, the stronger its surface tension. According to the Journal of Physical and Reference Data the surface tension of water at 20 degrees Celsius is That is surprisingly strong compared to other substances.
For example, the surface tension of pure ethanol at 20 degrees Celsius is just At degrees Celsius, the surface tension of water has decreased to You can see so for yourself in this trick. The paperclip 'floats' because it doesn't weigh enough to break the bonds between the water molecules apart.
When we talk about our mass, we usually say that we weigh X kilograms but weight is actually measured in Newtons. To calculate your weight here on Earth, you have to multiply your mass by the acceleration due to gravity, which is 9.
So, if your mass is 50 kilograms then you weigh Newtons. If you want to weigh less without exercising or changing your diet, just launch yourself into deep space where there is no gravity and you'll weigh 0 Newtons.
You'll still have a mass of 50 kilograms so your weight might change but not your waist. A single 33 millimetre paperclip has a mass of about 0.
If you scaled your paperclip up to the size of a car, however, it definitely would not 'float' because its weight would be more than enough to break the surface tension of water. Floating is not affected by the scale of an object this way.
So there you have it. A floating paperclip doesn't really float, but it does because it really doesn't weigh enough.Company.
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In the paper trade bulk is a more commonly used measure than density to indicating the "compactness" of paper. Bulk can be calculated by dividing the thickness of a sheet by its basis weight.
In some connections, bulk is used to express the thickness of paper or board according to the following equation.
Paper is a thin material produced by pressing together moist fibres of cellulose pulp derived from wood, rags or grasses, and drying them into flexible leslutinsduphoenix.com is a versatile material with many uses, including writing, printing, packaging, cleaning, decorating, and a number of industrial and construction leslutinsduphoenix.com are essential in legal or non-legal documentation. The density of water is kilograms per cubic metre. To make a paperclip 'float', bend one arm of a paperclip in half like this. Lay a second paperclip horizontally on top of the one you bent. TYPICAL DENSITY AND BULK OF SOME PAPERS. WOOD PROPERTIES. GRADES OF PAPER. GRADES OF PULP. GRADES OF WASTE PAPER RAW MATERIALS. PULP PROPERTIES. PAPER PROPERTIES. LENGTH OF PAPER IN ROLL. PAPER DEFECTS. PAPER THICKNESS. PAPER CALCULATORS. TYPICAL DENSITY AND BULK OF PAPER Trim office papers to your desired .
The density of pulp determines the weight of paper produced from the pulp. Retailers purchase and sell paper based on its weight per ream. Pulp density ultimately determines the quality of .
Open Ended Low Density Gusset Bag 12 X 8 X mils. Gusseted bags feature creased sides that expand to accommodate bulky items. Low Density Polyethylene (LDPE) bags are the most commonly used plastic bag because they provide excellent protection for everyday use at a great price.
Density, an intensive (or intrinsic) property, is a kind of "heaviness" factor. In macroscopic terms, density reflects how much mass is packed into a given three-dimensional space.
Typically, densities are reported g/ml or g/cm 3 (which are equivalent because 1ml ≡ 1cm 3).