The S.I. unit of pressure is

Options

A. atm
B. Pascal
C. Torr
D. mm Hg

Answer

To determine the S.I. unit of pressure, we can follow these steps:

### Step 1: Understand the Definition of Pressure
Pressure is defined as the force applied per unit area. This can be expressed mathematically as:
\[ \text{Pressure} = \frac{\text{Force}}{\text{Area}} \]

### Step 2: Identify the S.I. Unit of Force
The S.I. unit of force is the Newton (N).

### Step 3: Identify the S.I. Unit of Area
The S.I. unit of area is the square meter (m²).

### Step 4: Combine the Units
Using the definitions from Steps 2 and 3, we can express the S.I. unit of pressure as:
\[ \text{Pressure} = \frac{\text{Force}}{\text{Area}} = \frac{\text{Newton}}{\text{meter}^2} = \text{N/m}^2 \]

### Step 5: Recognize the Pascal
The unit N/m² is also known as Pascal (Pa). Therefore, the S.I. unit of pressure can be stated as:
\[ \text{Pressure} = 1 \text{ Pa} = 1 \text{ N/m}^2 \]

### Final Answer
The S.I. unit of pressure is Pascal (Pa).

---