For which measurement the 'decibel' is used?

Options

A. Haemoglobin in blood
B. Sound in environment
C. Sugar in urine
D. Water vapour in air

Explanation

**Step-by-Step Solution:**

1. **Understanding Decibel**: The first step is to understand what a decibel (dB) is. It is a unit that measures the intensity of sound.

2. **Identifying the Context**: The question asks for the specific measurement associated with decibels. We need to analyze the options provided: Hemoglobin in blood, sugar in wine, sound in environment, and water vapor in air.

3. **Analyzing the Options**:
- **Hemoglobin in blood**: This is typically measured in grams per deciliter (g/dL) and not in decibels.
- **Sugar in wine**: This is measured in terms of concentration or percentage, not in decibels.
- **Sound in environment**: This is where decibels are commonly used to measure sound intensity.
- **Water vapor in air**: This is usually measured in terms of humidity or concentration, not in decibels.

4. **Conclusion**: Based on the analysis, the correct answer is that decibels are used to measure the intensity of sound in the environment.

**Final Answer**: Decibels are used to measure sound in the environment.

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