In groups students had the opportunity to create their own saltwater tester using various household materials and a simple buzzer. The buzzer buzzed in saltwater because the saltwater acts like an invisible wire to connect the circuit. That's because when you add salt to water, the salt molecules dissolve in the water and break into smaller parts called ions. The ions carry electricity through the water. Fresh water doesn't have these ions, so it's harder for the electricity to move through the water. It doesn't complete the circuit, and the buzzer doesn't buzz.
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