An engineering start-up called SALt has invented a lamp that burns for eight hours at a time, running on nothing but a glass of water and two teaspoons of salt. Named the SALt (Sustainable Alternative Lighting) lamp, the device will also be able to generate enough energy to charge a smartphone via the USB port, while also lighting up the room.
The lamp was invented in response to the fact that, right now, there are about 1 billion people in the world who are living without electricity. This means if they want to get anything done after dark, whether it’s walking home from school or work, or doing homework, reading, or cooking at night, they have to light their way with dangerous and expensive kerosene lamps.
The SALt lamp works with a galvanic cell battery, which consists of an electrolyte solution – the salt and water – and two electrodes. When the electrodes are placed in the electrolyte, the energy generated kicks an LED light into gear. According to the developers, the battery will work for eight hours a day for six months, which is a considerable upgrade from the constant refills required by paraffin lantern. Source: This lamp runs on a glass of water and two teaspoons of salt