Bernoulli's equation pertains to the

Options

A. flow of electric current
B. flow of heat
C. flow of liquids
D. photoelectric effect

Answer

To solve the question "Bernoulli's equation pertains to what?", we will analyze the options and understand the context of Bernoulli's equation.

### Step-by-Step Solution:

1. **Understanding Bernoulli's Equation**:
Bernoulli's equation is a principle in fluid dynamics that describes the behavior of a fluid moving along a streamline. It relates the pressure, velocity, and height of a fluid at two points along its flow.

2. **Components of Bernoulli's Equation**:
The equation is expressed as:
\[ P_1 + \frac{1}{2} \rho V_1^2 + \rho g h_1 = P_2 + \frac{1}{2} \rho V_2^2 + \rho g h_2 \]
where:
- \( P \) is the pressure,
- \( \rho \) is the density of the fluid,
- \( V \) is the velocity of the fluid,
- \( g \) is the acceleration due to gravity,
- \( h \) is the height above a reference point.

3. **Identifying the Context**:
The equation is specifically applicable to incompressible fluids, which are typically liquids. It does not apply to gases under all conditions, nor does it pertain to electrical currents or heat flow.

4. **Evaluating Options**:
Given the context of the question, we need to determine the correct subject that Bernoulli's equation pertains to. The options likely include:
- A) Flow of gases
- B) Flow of electric current
- C) Flow of liquids
- D) Flow of heat

From our understanding, the correct answer is C) Flow of liquids.

5. **Conclusion**:
Bernoulli's equation is fundamentally concerned with the flow of liquids, making option C the correct choice.

### Final Answer:
Bernoulli's equation pertains to the flow of liquids.

---