Recent content by etherist

Thanks Q_Guest, is it i need a very close tolerance so the i can lessen the leakage? but what is the of it in friction? Is the friction depends on the gap? I wanted to produce an air spring, which if i applied a blow it will vibrate freely.

What is the tolerance for pneumatic cylinder and piston operating about 2 psi, at room temperature, so that the piston can move freely without leakage? The piston diameter is 20 mm.

What is the standard tolerance for a cylinder bore and piston? The working fluid is steam or compressed air.

The material necessary be nontoxic. It must be viscous at liquid states. I prefer an electrically conductive material and Non-Newtonian. The reason why i wanted a material that is liquid at room temperature but ductile at its solid state is because i wanted to produce a very small pipe filled...

It means that efficiency is greater than 1 or 100%, there is a gain of energy which violates law of conservation of energy.

I actually computed the total kinetic energy since the average kinetic energy is only equal to kT/2.

yes i compute the average kinetic energy of the molecules and then i multiply it with the total number of molecules using avogadros number and molecular weight so i computed the total kinetic energy1 kg steam of approximately 260 J, which is very small.

The kinetic energy of gas molecules or atoms is: (3/2)kTN/M where k is Boltzmann constant, T is absolute temperature, N is avogadros number and M is molecular weight. The formula is derived from http://en.wikipedia.org/wiki/Kinetic_theory. Assume that the gas is steam with M = 18 kg/mol at 373K...

Oh jbriggs444 thanks, it must be surface tension. I had solve the equation, i thought it was different in capillary tube formula since the bottom is open but as you explain it appears that it is the same. I thought the lifting force in this set-up depends on area, since the liquid is sticking on...

Formula for the maximum diameter of vertical tube(open on top and bottom) filled with viscous liquid (such as oil) as a function of viscosity and length so that the liquid remains inside. How the formula is derived? Thanks a lot.

Is there any material? Metal has a high melting point, it cannot be.

Is there any materials that is elastically solid (ductile that can be shaped into thin wires) at low temperatures but liquid at room temperatures?

Thanks bobbywhy, ferrofluid loudspeaker is a very helpful information for me. I desire to imitate how arthropods moves, using sound, thus it is necessary to design first a loudspeaker of very small size but sufficient power.

Thanks Bobbywhy. I am searching for ideal way of reciprocating pump much the same with the heart of arthropods works. I thought ferrofluid will help by static repulsion, but it will not cause reaction.

The ferrofluid is electrically connected to the top wire of a tesla coil. Is it will operate without return since i will use tesla coil? I want to test an experiment but i do not have tesla coil, and this set up of experiment is not available on youtube. Is there any vibration that will happen...