Additionally the alloy (a similar one, ingredient wise) is used for advanced medical procedures - inside people’s bodies in specific ultrasonic transmission devices. tiny ultrasonic snips and in ultrasonic breakage of things like kidney stones.
It is used in that way... as... if the fluid cable breaks (snaked into the body-device and cable are one), it poses no harm to the body and the body eliminates it, it flushes out.
it makes wonderful, wonderful transmission channel or path. it is between a gas and a solid, it is a fluid.
In the early-mid 90's the us government designed a balloon like antenna for use on tanks. they filled a oblong balloon with a particular chargeable gas and then ran their RF energies and frequencies through it.
the antenna ended up being entirely non directional, and not bandwidth limited and could handle any complex multiplexing load that could be described by the transmission hardware. that the antenna had no shape/bandwidth/frequency range limitation. that the two normal parameters ---did not correlate.
those parameters are: antenna shape and size vs what the antenna can transmit or receive. these aspects have been worked out into solid functional math so the one can take a piece of wire then on paper perfectly predict how it works as an antenna.
with the charged gas antenna, all the rules went away. their principle desire was to be able to grow a new antenna if the old one was shot off or broken off. with the gas bag antenna, all they had to do is inflate a new one out the hole where the old one was. Instant fix, and no limitations of any kind as a side effect.
You'll find old reports about it and finding those reports about it were more common on the older web, lets say 12-15 years ago or more. It went black since then, no further data found. although the math, the physics and the results are sound. this is all known stuff for charged gasses.
In the case of a fluid metal alloy for a 'transmission line' or 'antenna', we end up with a combination of the known aspects of the theory and the math at the same time, some of it is thrown out and we get to the results of the charged gas antenna, of 'no limits'.
wire has limits and screws up at all frequencies except one, and that is tied to it's psychical dimensions and the materials it is made of. A wire cable's complex LCR is a function of the solid lattice structure of the wire itself.
with the fluid metal cable, those limitations don't exist. and like the charged gas antenna, if it is made into an inductor coil, things get weird. really freaking weird. but the bandwidth, the transient response and the quality of wave that it can deal with and pass along, is off the charts as compared to wire. Totally different and pretty well superior to wire (scientifically indisputably so) in any way one wants to calculate or imagine. one of those weird cases where informing people of the science of it seems like commercial spam, even if it isn't.