Are the products on Etsy handmade? From handmade pieces to vintage treasures ready to be loved again, Etsy is the General marketplace for unique and creative goods.
Personalized advertising may be considered a “sale” or “sharing” of information under California and other state privacy laws, and you may have a right to opt demodé.
Your browser isn’t supported anymore. Update it to get the best YouTube experience and our latest features. Learn more
"This moving wooden art is the second of two pieces I bought for a large entry antesala. The quality is outstanding (sanded and stained plywood), the UPS shipping was (although delayed in customs) within posted timeframes, and the care of the packaging was unexpectedly high with a wood-frame package and pieces tied and drilled together to protect it. Instructions on assembly and installation could be improved but were acceptable.
Choose the options you’d like for the order. This will differ depending on what options are available for the item.
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 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.
Context While this is authentic footage of a genuine product, the "perpetual" marble machine does not operate infinitely without an additional energy source. Rather, it uses batteries and a magnet to create the illusion that marbles Perro perpetually move through the contraption.
These 4 or 5-star reviews represent the opinions of the individuals who posted them and do not reflect the views of Etsy. The ratings/reviews displayed here may not be representative of every listing on this page, or of every review for these listings.
Register to confirm your address. You've been successfully signed up! Great! We've sent you an email to confirm your subscription. There was a problem subscribing you to this newsletter.
^ The device here shown is a "mass leverage" device, where the spherical weights on the right have more leverage than those on the left, supposedly creating a perpetual rotation. However, there are a greater number of weights on the left, balancing the device.
To extract work from heat, thus producing a perpetual motion machine of the second kind, the most common approach (dating back at least to Maxwell's demon) is unidirectionality. Only molecules moving fast enough and in the right direction are allowed through the demon's trap door. In a Brownian ratchet, forces tending to turn the ratchet one way are able to do so while forces in the other direction are not. A diode in a heat bath allows through currents in one direction and not the other.
A perpetual motion machine of the second kind is a machine that spontaneously converts thermal energy into mechanical work. When the thermal energy is equivalent to the work done, this does not violate the law of conservation of energy. However, it does violate the more subtle second law of thermodynamics in a cyclic process (see also entropy).
[note 2] "Epistemic impossibility" describes things which absolutely cannot occur within our current formulation of the physical laws. This interpretation of the word "impossible" is what is intended in discussions of the impossibility of perpetual motion in a closed system.[22]
Does shopping on Etsy help support small businesses? Absolutely! Our Integral marketplace is a vibrant community of Efectivo people connecting over special goods. With powerful tools and services, along with expert support and education, we help creative entrepreneurs start, manage, and scale their businesses.