The atmospheric pressure on Mars is o.61 kPa. What is the pressure in mm Hg?

Options

A. 0.63
B. 4.6
C. 6.3
D. 3.2

Explanation

To convert the atmospheric pressure on Mars from kilopascals (kPa) to millimeters of mercury (mm Hg), follow these steps:

### Step-by-Step Solution:

1. **Understand the Conversion Factors**:
- 1 mm Hg is equivalent to 133.322 Pa (Pascals).
- 1 kPa is equal to 1000 Pa.

2. **Convert kPa to Pa**:
- Given atmospheric pressure on Mars = 0.61 kPa.
- Convert kPa to Pa:
\[ 0.61 \text{ kPa} = 0.61 \times 1000 \text{ Pa} = 610 \text{ Pa} \]

3. **Convert Pa to mm Hg**:
- Use the conversion factor:
\[ 1 \text{ mm Hg} = 133.322 \text{ Pa} \]
- To find the pressure in mm Hg, use the formula:
\[ \text{Pressure in mm Hg} = \frac{\text{Pressure in Pa}}{\text{Pa per mm Hg}} = \frac{610 \text{ Pa}}{133.322 \text{ Pa/mm Hg}} \]

4. **Perform the Calculation**:
- Calculate the above expression:
\[ \text{Pressure in mm Hg} = \frac{610}{133.322} \approx 4.58 \text{ mm Hg} \]

5. **Round to Appropriate Significant Figures**:
- The result can be rounded to 4.6 mm Hg.

### Final Answer:
The atmospheric pressure on Mars is approximately **4.6 mm Hg**.

---