Zippo Hand Warmer as a Hot Water Bottle
A Zippo Hand Warmer costs about A$30 on Amazon. It uses about 2o mls of ligher fluid over 12 hours. If lighter fluid has about the same calorific value as kerosene then a litre produces about 9-10,000 watts so 20 mls produces 180 watts which over 12 hours equals approximately 15 watts per hour. You […]