4M Green Science Water Powered Clock
No batteries, no electricity from the wall — this clock runs entirely on water (and a tiny bit of salt to increase conductivity). Build the circuit, fill the water chambers, and a real digital LCD clock lights up and keeps accurate time. The science behind it: water and dissolved ions create a weak electrochemical cell, similar in principle to a battery. The 24-page experiment guide explains electrochemistry, how batteries work, why salt water conducts electricity, and the history of early electric cells from Alessandro Volta to today. After the main project, 10 additional experiments explore electrical conductivity with other household liquids. A brilliant demonstration of clean energy principles that makes abstract chemistry tangible.
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