1 Calorie equals

Options

A. 0.42 J
B. 4.2 J
C. 420 J
D. 4200 J

Explanation

To find out how many joules are equivalent to 1 calorie, we can follow these steps:

### Step 1: Understand the Units
1. **Identify the Units**: We need to compare two units of energy: calorie and joule.
- 1 calorie (cal) is a unit of heat energy.
- Joules (J) is the SI unit of energy.

### Step 2: Use the Conversion Factor
2. **Know the Conversion Factor**: The conversion factor between calories and joules is essential.
- It is known that 1 calorie is approximately equal to 4.186 joules.

### Step 3: State the Result
3. **State the Result**: Based on the conversion factor, we can conclude:
- 1 calorie = 4.186 joules.

### Step 4: Conclusion
4. **Final Answer**: Therefore, when asked how many joules are in 1 calorie, the answer is:
- 1 Calorie = 4.186 Joules.