Pressure cannot be measured in

Options

A. `Nm^(-2)`
B. bar
C. Pascal
D. kgwt

Explanation

To solve the question "Pressure cannot be measured in," we will analyze each of the given options to determine which one does not represent a unit of pressure.

### Step-by-Step Solution:

1. **Understanding Pressure**:
Pressure is defined as the force applied per unit area. The formula for pressure (P) is given by:
\[ P = \frac{F}{A} \]
where \( F \) is the force and \( A \) is the area.

2. **Units of Pressure**:
- The SI unit of force is Newton (N), and the unit of area is square meters (m²). Therefore, the unit of pressure can be expressed as:
\[ \text{Pressure} = \frac{\text{Newton}}{\text{meter}^2} = \text{Newton} \cdot \text{meter}^{-2} \]
This corresponds to option 1: Newton into meter inverse whole square.

3. **Analyzing Option 2 (Bar)**:
- The bar is a unit of pressure. It is defined as:
\[ 1 \text{ bar} = 10^5 \text{ pascal} = 10^5 \text{ Newton/m}^2 \]
Therefore, option 2 is a valid unit of pressure.

4. **Analyzing Option 3 (Pascal)**:
- Pascal (Pa) is the SI unit of pressure, defined as:
\[ 1 \text{ Pascal} = 1 \text{ Newton/m}^2 \]
Thus, option 3 is also a valid unit of pressure.

5. **Analyzing Option 4 (kg into weight)**:
- The term "kg into weight" can be interpreted as mass multiplied by gravitational force. The weight (W) is given by:
\[ W = m \cdot g \]
where \( g \) is the acceleration due to gravity (approximately \( 9.8 \text{ m/s}^2 \)). Therefore, \( \text{kg} \cdot \text{weight} \) is a unit of force (specifically, it can be converted to Newtons):
\[ 1 \text{ kg} \cdot \text{weight} = 1 \text{ kg} \cdot 9.8 \text{ m/s}^2 = 9.8 \text{ N} \]
Since this represents a unit of force, it cannot be used to measure pressure.

### Conclusion:
Based on the analysis, the answer to the question "Pressure cannot be measured in" is:
**Option 4: kg into weight.**