Density of an object that floats. - Page 2

blackmage_nuke · 09-17-2007, 10:35 PM

The water thing wouldnt work if there was an empty chamber inside the object with no entrance

Vivisteiner · 09-17-2007, 10:38 PM

^Yes it would, wouldnt it?

Why wouldnt it work?

Little Blue · 09-17-2007, 10:40 PM

You'd have a sealed air cavity inside that water would'nt flow into. Therefore more water would be displaced than there should be, which gives an oversized volume measurement, and would result in an underestimate of the density.

Vivisteiner · 10:49 PM

^Yeah, but the density of the overall thing would still be accurate.

But I see what you mean - If you want to find out the density of that type of wood and not just the density of the object, then it wouldnt work. Its like a steel boat. The steel is more dense than water, but the overall density of the boat is less dense than water.

Little Blue · 09-17-2007, 10:49 PM

Yup. I guess it depends on the aims of qwertyxsora's experiment then, but I'd imagine it'll probably be assumed to be a solid lump of wood with a uniform mass distribution inside.

qwertyxsora · 09-18-2007, 02:33 AM

I was referring to the stochiometry in Tavrobels awnser, sorry if I confused you a little. It's a lab that is supposed to connect the chemistry and botany classes. But I don't take Botany so I don't get to do the Botany half of the lab. The Chem half of the lab is determining several properties of different wood samples. My friend who takes Botany says that they then take those findings and determine why those properties were favored for natural selection.

Tavrobel · 09-18-2007, 02:40 AM

You know there's like, 3000 different types of wood, right? Unless your friend has the type as a given.

No euphemism intended.

qwertyxsora · 09-18-2007, 02:52 AM

No, it is a structured lab. Were are comparing wood from four different species of tree, and then we get a sample from an unknown tree and must find which tree it is the most similar to. Then the botany half I was told that they will investigate why specific traits developed, and which known sample was the closest to the unknown, and then they create a cladogram with the five wood samples.

blackmage_nuke That's me!! Location: Yes	#9 The water thing wouldnt work if there was an empty chamber inside the object with no entrance
09-17-2007, 10:35 PM

Vivisteiner Steiner is God Location: Vivi	#10 (permalink) ^Yes it would, wouldnt it? Why wouldnt it work?
09-17-2007, 10:38 PM

Little Blue The Final Front Ear. Location: The Docks	#11 (permalink) You'd have a sealed air cavity inside that water would'nt flow into. Therefore more water would be displaced than there should be, which gives an oversized volume measurement, and would result in an underestimate of the density.
09-17-2007, 10:40 PM

Little Blue The Final Front Ear. Location: The Docks	#13 (permalink) Yup. I guess it depends on the aims of qwertyxsora's experiment then, but I'd imagine it'll probably be assumed to be a solid lump of wood with a uniform mass distribution inside.
09-17-2007, 10:49 PM

Tavrobel By the dog, Gorgias. Location: Conjunction Junction	#15 (permalink) You know there's like, 3000 different types of wood, right? Unless your friend has the type as a given. No euphemism intended.
09-18-2007, 02:40 AM