Salt concentration (parts per thousand) is less than 5% in

Options

A. sea water
B. inland water
C. hypersaline water
D. freshwater

Answer

To determine which option has a salt concentration (salinity) of less than 5%, we will analyze each option based on the information provided about their salt concentrations.

### Step-by-Step Solution:

1. **Understanding Salt Concentration**:
- Salt concentration, also known as salinity, is measured in parts per thousand (ppt). This indicates how much salt is dissolved in a given volume of water.

2. **Analyzing Each Option**:
- **Option 1: Sea Water**:
- Sea water has an average salt concentration of about 3.5%. This means that in 1000 ml of sea water, there are approximately 35 grams of dissolved salts. Since 3.5% is less than 5%, this option is not correct as we are looking for a concentration less than 5% specifically.

- **Option 2: Inland Water**:
- Inland water typically has a salt concentration of less than 5%. This means that in 1000 ml of inland water, there would be less than 50 grams of dissolved salts. This option fits the criteria of having a salt concentration less than 5%, making it a potential correct answer.

- **Option 3: Hyper Saline Water**:
- Hyper saline water has a very high salt concentration, around 10%. This means that in 1000 ml of hyper saline water, there are about 100 grams of dissolved salts. Since 10% is greater than 5%, this option is incorrect.

- **Option 4: Fresh Water**:
- Fresh water has a very low salt concentration, typically around 0.5%. This means that in 1000 ml of fresh water, there are only about 5 grams of dissolved salts. While this is less than 5%, it is not the best fit for the question which asks for a concentration that is less than 5% in a more general sense.

3. **Conclusion**:
- After analyzing all the options, the correct answer is **Inland Water**, as it has a salt concentration of less than 5%.

### Final Answer:
**Inland Water** is the correct option where salt concentration (parts per thousand) is less than 5%.