2007-02-15 07:49:07 · 3 answers · asked by L V 1 in Science & Mathematics ➔ Weather
I think it is about 33 feet. You can check by comparing the density of water to the density of mecury.
Look at link also
2007-02-15 07:59:10 · answer #1 · answered by Ernie 4 · 1⤊ 0⤋
Water barometers require a tube about 12m long. As well as the column of water you need space for the vacuum above it so you can see what is happening. The water column itself is about 10m high. Many science classes in schools have constructed them. Use a coloured dye in the water to see what is happening better.
You can use any liquid for a barometer. Blaise Pascal the French scientist, constructed one with a 14m tube using red wine as the liquid. A red wine barometer has the advantage that you can have a party after the experiment. Pascal has been honoured by having the unit of pressure named after him and barometric pressure is recorded in hectoPascals.
2007-02-15 12:06:55 · answer #2 · answered by tentofield 7 · 0⤊ 0⤋
To create a vacuum with water takes a column over 30 feet long, while with mercury it takes less than three feet.
2007-02-15 08:28:53 · answer #3 · answered by 1ofSelby's 6 · 0⤊ 0⤋