2.	The specific weight of water is 9.81 m3kg.  Express this in English units.

To express the specific weight of water in English units, we need to convert from the SI unit \( \text{N/m}^3 \) (where \( \text{N} = \text{kg} \cdot \text{m/s}^2 \)) to the English unit \( \text{lbf/ft}^3 \) (pound-force per cubic foot).

Given:
- Specific weight in SI units: \( 9.81 \, \text{N/m}^3 \)

Let's break down the conversion:

1. **Convert Newtons to pound-force (lbf):**

   \[ 1 \, \text{N} = 0.224809 \, \text{lbf} \]

2. **Convert cubic meters to cubic feet:**

   \[ 1 \, \text{m}^3 = 35.3147 \, \text{ft}^3 \]

Now, perform the conversion:

\[
\text{Specific weight} = 9.81 \, \text{N/m}^3 \times \frac{0.224809 \, \text{lbf}}{1 \, \text{N}} \times \frac{1 \, \text{m}^3}{35.3147 \, \text{ft}^3}
\]

Calculating this:

\[
\text{Specific weight} \approx 9.81 \times 0.224809 \div 35.3147 \, \text{lbf/ft}^3
\]

\[
\text{Specific weight} \approx 0.06243 \, \text{lbf/ft}^3
\]

So, the specific weight of water in English units is approximately \( 0.06243 \, \text{lbf/ft}^3 \).

Would you like more details on any part of this conversion? Let me know if you have any questions.

### Related Questions:
1. What is the specific weight of water in different units like kg/m³ or lb/ft³?
2. How do you convert specific gravity to specific weight?
3. What is the difference between specific weight and density?
4. How does temperature affect the specific weight of water?
5. Can the specific weight of other fluids be compared using the same method?
6. What is the specific weight of seawater compared to freshwater?
7. How does the specific weight of water change with pressure?
8. How do you measure specific weight experimentally?

**Tip:** Always ensure unit consistency when performing calculations, especially when converting between different measurement systems.

Learn how to convert the specific weight of water from 9.81 N/m³ to lb/ft³ using detailed unit conversion steps. Understand the conversion formulas for Newton to pound-force and cubic meter to cubic feet. Suitable for advanced high school students and anyone interested in physics and unit conversions.

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