An unknown immiscible liquid seeps into the bottom of an open oil tank. some measurements indicate that the depth of the unknown liquid is 1.5 m and the depth of the oil(specificweight=8.5kn/m3)floatin g on top is 5.0 m. a pressure gage connected to the bottom of the tank reads 65 kpa. what is the specific gravity of the unknown liquid?

The specific gravity of the unkown liquid is 15.

Explanation:

Gauge pressure, at the bottom of the tank in this case, can be calculated from

where and are the height of the column of oil and the unkown liquid, respectively. Writing for , we have

Relative to water, the unknow liquid specific weight is 15 times bigger, therefore this is its specific gravity as well.

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