Editing Perpetual motion (section)

=== Resource consuming ===
[[Image:Boyle'sSelfFlowingFlask.png|thumb|The "capillary bowl"]]

Some examples of such devices include:
* The [[drinking bird]] toy functions using small ambient temperature gradients and evaporation. It runs until all water is evaporated.
* A [[capillary action]]-based water pump functions using small ambient temperature gradients and [[vapour pressure]] differences. With the "capillary bowl", it was thought that the capillary action would keep the water flowing in the tube, but since the [[cohesion (chemistry)|cohesion force]] that draws the liquid up the tube in the first place holds the droplet from releasing into the bowl, the flow is not perpetual.
* A [[Crookes radiometer]] consists of a partial vacuum glass container with a lightweight propeller moved by (light-induced) temperature gradients.
* Any device picking up minimal amounts of energy from the natural [[electromagnetic radiation]] around it, such as a solar-powered motor.
* Any device powered by changes in air pressure, such as some clocks ([[Cox's timepiece]], [[Beverly Clock]]). The motion leeches energy from moving air which in turn gained its energy from being acted on.
* A [[heat pump]], due to it having a [[Coefficient of performance|COP]] above 1: the energy it consumes as work is less than the energy it moves as heat.
* The [[Atmos clock]] uses changes in the vapor pressure of ethyl chloride with temperature to wind the clock spring.
* A device powered by induced nuclear reactions or by [[radioactive decay]] from an isotope with a relatively long [[half-life]]; such a device could plausibly operate for hundreds or thousands of years.{{Citation needed|date=August 2024}}
* The [[Oxford Electric Bell]] and the {{ill|Karpen Pile|ro|Pilă Karpen}} are driven by [[Voltaic pile|dry pile]] batteries.