why they say a perpetum mobil its imposible what about the drinking bird?

[winny]

Originally Posted by raaaid

actually the dippy bird makes me realize how stupid i am

maybe you can help me:

water evaporates from the peak gaining energy from the sun

bird produces work

same amount of water condensates giving back all the energy from the sun

then from what energy has the bird produced work?

Raaid, go and google 'dippy bird' there are plenty of pages that describe how these work... They get the energy from the Sun! It's absorbed by the chemical, it rises up the tube, tips the bird, the water then evapourates and the balance is tipped the other way. Gravity is also at work here.. It's not rocket science.

[WTE_Galway]

So if they get energy from the sun why don't they stop at night ?

[winny]

Originally Posted by WTE_Galway

So if they get energy from the sun why don't they stop at night ?

Because it's stored as heat in the chemical and the atmosphere. If the chemical is warm enough it will rise up the tube, regardless of what time of day it is.