The transfer of heat by convection can take place in

Options

A. solids and liquids
B. solids and vacuum
C. gases and liquids
D. vacuum and gases

Answer

To solve the question regarding the transfer of heat by convection, we need to understand the concept of convection and the mediums through which it can occur. Here’s a step-by-step breakdown:

### Step 1: Understand Convection
Convection is a method of heat transfer that occurs in fluids. This includes both liquids and gases. It involves the movement of the fluid itself, which carries heat from one place to another.

**Hint:** Remember that convection requires the movement of particles in a medium.

### Step 2: Identify the Mediums
Convection can only occur in mediums that can flow. This means that solids cannot be involved in convection because their particles are fixed in place and cannot move freely.

**Hint:** Think about which states of matter can flow and carry heat.

### Step 3: Evaluate the Options
Now, let's evaluate the options given in the question:
1. Solid and liquid - Incorrect, as solids cannot transfer heat by convection.
2. Solid and vacuum - Incorrect, as solids cannot transfer heat by convection and vacuum has no particles to transfer heat.
3. Gases and liquids - Correct, as both are fluids and can flow, allowing for convection to occur.
4. Vacuum and gases - Incorrect, as vacuum cannot transfer heat by convection.

**Hint:** Look for combinations that include only fluids (gases and liquids).

### Step 4: Conclusion
Based on the evaluation, the correct answer is that convection can take place in gases and liquids.

**Final Answer:** The transfer of heat by convection can take place in gases and liquids.