SI unit of atmospheric pressure is

Options

A. Newton
B. Pascal
C. Joule
D. kg/m

Explanation

To solve the question "What is the SI unit of atmospheric pressure?", we can follow these steps:

### Step 1: Understand Atmospheric Pressure
Atmospheric pressure is defined as the pressure exerted by the weight of the atmosphere above a certain point. It is measured at sea level and is influenced by various factors including altitude and weather conditions.

**Hint:** Remember that atmospheric pressure is related to the weight of the air above us.

### Step 2: Identify the Unit of Pressure
The SI unit of pressure is the Pascal (Pa). One Pascal is defined as one Newton per square meter (N/m²).

**Hint:** Think about how pressure is calculated: it is force applied over an area.

### Step 3: Relate Atmospheric Pressure to the Pascal
At sea level, the average atmospheric pressure is approximately 101325 Pascals. This value is often used as a reference point for atmospheric pressure.

**Hint:** Consider the numerical value associated with atmospheric pressure at sea level.

### Step 4: Conclusion
Thus, the SI unit of atmospheric pressure is the Pascal (Pa).

**Final Answer:** The SI unit of atmospheric pressure is Pascal (Pa).