thermometer when was it invented and by who
Best Answer: The thermometer was invented by Galileo Galilei in 1593. His thermometer consisted of water in a glass bulb; the water moved up and down the bulb as the temperature changed. The sealed thermometer was invented in 1641 by the Grand Duke Ferdinand II. He used a glass tube containing alcohol, which freezes well below the freezing point of water (alcohol freezes at -175Â°F=-115Â°C). He sealed the tube to exclude the influence of air pressure.