If two water samples of equal mass had equal salinities, which sample would be more dense: water sample a, which has a temperature of 25°c, or water sample b, which has a temperature of 14°c?

The 14°C sample is more dense than the 25°C sample.

Explanation:

Warm water rises, cooler water falls. Warm water is less dense than cooler water. The actual density of water changes about .4% as the water temperature changes from near zero at 0°c up to about 30°c. That may not sound like much. However, that is enough density change for cold water to flow below warm water. This can have an impact on ocean currents and other phenomena in the ocean.

The sample water would be more dense.

Explanation:

As it has been proved that the density of a water depends on its salinity and its temperature.  The cold water is denser and it will be less dense when it is warm. The density is dependent on the salinity too.

So, it is evident that among the two mentioned samples the sample B with the temperature of 14 degree will be denser than the sample of salty water that has 25 degree temperature.

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