Could anyone help solve this rather strenuous task I've been challanged with?
A) Investigate and with use of diagrams evaluate the methods that might be used to determine the density of;
- A solid material
- The density of a liquid
I obviously have to research different methods of finding a density of material and then evaluate them with diagrams etc. but how does anyone know multiple methods of finding the density of a liquid? I really should have went to the library and checked out some books on this matter.
[QUOTE=ZeroMinus;29018677] but how does anyone know multiple methods of finding the density of a liquid?[/QUOTE]
The first one is obvious; fill a container of known volume with the liquid, then weigh it, substract the mass of the container from that, and then calculate the density from the result.
I'm not sure of any other methods though. I suppose you could compare densities of liquids that don't mix by pouring them in the same container, but that won't give you any exact results.
Ive just been having fun with the basic principle of density - Density=mass/volume, quite a lot of possibilities. A better method that for the liquid is a density bottle (pyncometer) then obviously find volumes on regular solids by length x width x height and water displacement for irregular shapes.
I'm just looking for more than the obvious. I guess you could find the mass of an object by dropping it from a height and timing how long it takes to hit the ground taking gravity into account etc.
To find a liquid density, you weigh a graduated cylinder, then fill the cylinder with a liquid that you wish to find the density of. Record the volume you put in. Weigh the cylinder and liquid together, then subtract the weight of the cylinder that you recorded earlier. Density is mass/volume. Don't forget to use SI base units. For the density of a solid. You must find the volume and mass. Weigh the mass of the object. Record that. Fill a graduated cylinder with water and record the volume you put in. Put the object into the cylinder with the water. Measure what the volume of the water is now with the object in it. Subtract the final volume by the initial volume. Density = mass/volume. Use SI Base units.
[QUOTE=Zareox7;29019830]To find a liquid density, you weigh a graduated cylinder, then fill the cylinder with a liquid that you wish to find the density of. Record the volume you put in. Weigh the cylinder and liquid together, then subtract the weight of the cylinder that you recorded earlier. Density is mass/volume. Don't forget to use SI base units. For the density of a solid. You must find the volume and mass. Weigh the mass of the object. Record that. Fill a graduated cylinder with water and record the volume you put in. Put the object into the cylinder with the water. Measure what the volume of the water is now with the object in it. Subtract the final volume by the initial volume. Density = mass/volume. Use SI Base units.[/QUOTE]
I know that - Its more of research thing to see who out of the top of class (only a few got chosen to do this, me being included) so I'm just thinking I will have to pull something out the box If I want to do ace this test.
The most basic methods I have got is the obvious;
Liquid Density
Weigh empty measuring cylinder. Pour liquid in and note volume Reweigh. Find weight changes (gives mass)/ Density = mass/volume.
A more accurate method uses a density bottle.
Solid Density
Regular shapes: measure it size, calculate volume, weigh it. Density =mass/volume
Irregular shapes. Fully immerse in water. Note displacement (change of water level on volume scale; this gives the volume), weigh it. Density =mass/volume
Need some more ideas or unique ideas for finding the density of solid/liquid, I'm going to do some research but if anyone can think of any different from usual methods feel free to mention them.
snip
Isn't there also some way of measuring the density of liquids with a laser (measuring the intensity).
[QUOTE=Number-41;29020031]snip
Isn't there also some way of measuring the density of liquids with a laser (measuring the intensity).[/QUOTE]
Have you been taught about that before? It sounds like a good idea for a method if someone could elaborate on it some more.
[url]http://www-ferp.ucsd.edu/LIB/REPORT/UCSD-ENG/UCSD-ENG-114.pdf[/url] this seems pretty elaborate...
Any other ideas?
[QUOTE=samframpton;29020988][url]http://www-ferp.ucsd.edu/LIB/REPORT/UCSD-ENG/UCSD-ENG-114.pdf[/url] this seems pretty elaborate...[/QUOTE]
not really relevant since they're not trying to study the density of a plasma.
if it's a crystalline solid, you can calculate the density if you know the type of atomic packing involved and the atomic radii.
if it's a liquid, i think there's a way to predict a value mathematically but i've not ever used it.
[QUOTE=mike;29023902]not really relevant since they're not trying to study the density of a plasma.
if it's a crystalline solid, you can calculate the density if you know the type of atomic packing involved and the atomic radii.
if it's a liquid, i think there's a way to predict a value mathematically but i've not ever used it.[/QUOTE]
Could you share the liquid prediction method please.
It's called the Girolami method. It does only offer a prediction and I've never known anyone to use it, more just as a curiosity than anything else.
If I want to determine the method of something, I just weigh a known volume of it: it's a quick and easy method and is the only way really to get an accurate measurement. There aren't really any other ways of doing it because there doesn't need to be, this is the most effective one.
I think it's probably beyond the scope of what you're doing but if you want to read up on it more - the original paper can be found here [url]http://pubs.acs.org/doi/abs/10.1021/ed071p962[/url]
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