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Thor999 · 01-31-2008, 11:01 AM

I have a science project which require me make a mini sub(10cmx10cmx10cm) that is able to float and sink.
I had thought of pumping hot air to make it float through a lighter, hence, reducing its density.But i dont know if it will work of not.Sinking is easy
Suggestion and opinions pls.

TakeshiXkun · 01-31-2008, 11:19 AM

hmm the project allow oil or any other substances like special kind of liquids?

if yes,then maybe trying pouring oil or other thing same as oil if you like.

anyway heating is good.

Moshi2 · 01-31-2008, 11:41 AM

hmm u can use 2 ways to increase/decrease the water density... first is by heating/cooling and the second one is by adding another substance, like salt or sugar

one way which i think is pretty easy to do is first, make the submarine stay in the middle of the water. (fill the sub by only fresh water, and add some salt to the environment to cause the sub doesnt sink and doesnt float). then to make it sink, and some water to the environment. to make it float again, add some salt to the environment. so, in this case, u play with the water in ur environment, not the water inside ur submarine...

hope it works

01-31-2008, 11:01 AM	#1 (permalink)
Thor999 Pikachu's Flea Collar Join Date: Jun 2007 Location: Singapore Posts: 54 Reputation: 10	Help for Science project(PLS LOOK) I have a science project which require me make a mini sub(10cmx10cmx10cm) that is able to float and sink. I had thought of pumping hot air to make it float through a lighter, hence, reducing its density.But i dont know if it will work of not.Sinking is easy Suggestion and opinions pls.

01-31-2008, 11:19 AM	#2 (permalink)
TakeshiXkun Manic's Maniacal Machine Join Date: Sep 2006 Location: Singapore Posts: 1,913 Reputation: 10	hmm the project allow oil or any other substances like special kind of liquids? if yes,then maybe trying pouring oil or other thing same as oil if you like. anyway heating is good. __________________ Games i am Playing: Return Of Warrior-Ichman-Valgor Elf Online-Dragon City-Valgor Games i am waiting for: PW,GTH,WindSlayer,Tcrew,Dragonica

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01-31-2008, 11:41 AM	#3 (permalink)
Moshi2 Rock Man Join Date: Oct 2007 Posts: 420 Reputation: 10	hmm u can use 2 ways to increase/decrease the water density... first is by heating/cooling and the second one is by adding another substance, like salt or sugar one way which i think is pretty easy to do is first, make the submarine stay in the middle of the water. (fill the sub by only fresh water, and add some salt to the environment to cause the sub doesnt sink and doesnt float). then to make it sink, and some water to the environment. to make it float again, add some salt to the environment. so, in this case, u play with the water in ur environment, not the water inside ur submarine... hope it works