Salinity is the amount of salt in grams present in 1000 grams of water.The average salinity of the oceans is 35 parts per thousand

Salinity is expressed as the amount of salt in grams dissolved in sea water per

Salinity is a measure of the concentration of dissolved salts in water, specifically in this case, seawater. It is typically expressed as the amount of salt in grams dissolved in a given amount of water. In this question, the options provided represent different amounts of water in grams.

The Correct Answer

The correct answer is option B, which states that salinity is expressed as the amount of salt in grams dissolved in 1,000 grams of seawater.

Explanation

To understand why option B is the correct answer, we need to consider the concept of salinity and how it is measured.

What is Salinity?

Salinity refers to the total amount of dissolved salts in seawater. These salts primarily consist of sodium chloride (common table salt) but can also include other minerals and ions such as magnesium, calcium, and potassium.

Expressing Salinity

Salinity is typically expressed as a ratio or a percentage. The most common unit of measurement for salinity is parts per thousand (ppt) or ‰. It represents the number of grams of salt dissolved in one kilogram (1,000 grams) of seawater.

Why Option B is Correct?

Option B states that salinity is expressed as the amount of salt in grams dissolved in 1,000 grams of seawater. This aligns with the standard unit of measurement for salinity, which is parts per thousand (ppt). Therefore, option B is the correct answer.

Other Options

Let's briefly discuss why the other options are incorrect:

- Option A states that salinity is expressed as the amount of salt in grams dissolved in 10 grams of seawater. This is not a practical unit of measurement for salinity as it represents an extremely concentrated solution.

- Option C suggests that salinity is expressed as the amount of salt in grams dissolved in 100 grams of seawater. While this unit of measurement is closer to the correct answer, it does not align with the standard unit of parts per thousand (ppt).

- Option D states that salinity is expressed as the amount of salt in grams dissolved in 10,000 grams of seawater. This would represent a diluted solution, which is not consistent with the concept of salinity.

Conclusion

Salinity is expressed as the amount of salt in grams dissolved in a given amount of seawater. The standard unit of measurement for salinity is parts per thousand (ppt), which represents the number of grams of salt dissolved in one kilogram (1,000 grams) of seawater. Therefore, option B is the correct answer.