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Q: Weight of Earth's salt water. ( Answered ,   1 Comment )
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 Subject: Weight of Earth's salt water. Category: Miscellaneous Asked by: pdy-ga List Price: \$10.00 Posted: 28 Mar 2006 23:04 PST Expires: 28 Apr 2006 00:04 PDT Question ID: 713034
 ```Plus or minus %10 percent what is the total weight, in tons, of all the salt water on Earth?```
 ```Hello pdy-ga, Thank-you for your question. First of all I should note here that it is difficult for these numbers to be exact because of a number of factors; most notably the volume of saline water on the Earth is only an estimate and the density of saline water can also alter (depending on a number of factors). That being said we can calculate the mass of saline water on Earth using a few simple facts. An estimate of the total volume of saline water on the Earth can be calculated from this page: http://ga.water.usgs.gov/edu/earthwherewater.html The table gives: Oceans, Seas, & Bays - 1,338,000,000 km3 Saline Groundwater - 12,870,000 km3 Saline Lakes - 85,400 km3 This is a total of 1350955400 km3 of saline water. Using OnlineConversion.com we know that 1 km3 is the same as 1000000000 m3. Therefore the total volume of water in cubic meters is 1350955400 x 1000000000 m3 or 1350955400000000000 m3. According to the Wikipedia the concentration of sea water (which makes up the vast majority of the saline water in the world) varies from 1020-1030 kg m-3. http://en.wikipedia.org/wiki/Sea_water Therefore we can calculate an approximate upper and lower limit from this density figure. Lower: 1020 kg m-3 x 1350955400000000000 m3 = 1377974508000000000000 kg Higher: 1030 kg m-3 x 1350955400000000000 m3 = 1391484062000000000000 kg One metric ton is equal to 1000 kg. This gives our lower estimate a value of 1377974508000000000 tons and the higher estimate a value of 1391484062000000000 tons! Because of the inaccuracy of these numbers (see my opening comments) we should probably quote the mass of salty water to be approximately 1.38x10^18 tons. I hope that this answers your question. Should you require any further assistance on this matter please do not hesitate to ask for clarification.```
 pdy-ga rated this answer: `Well done.`
 ```This may interest you: What percentage of Earth's water is saline? Answer: About 97.2% of Earth's water is saline water, located in the oceans and seas. http://ga.water.usgs.gov/edu/saline.html Rainbow~```