1 calorie is equivalent to how many joules?

The correct answer is based on the defined equivalence between calories and joules in the context of energy measurement. Specifically, one calorie is defined as the amount of energy required to raise the temperature of one gram of water by one degree Celsius at a specified pressure. This energy is equivalent to approximately 4.184 joules.

The significance of this conversion is vital in various fields such as thermodynamics, cooking, and nutrition, where energy calculations are fundamental. Understanding this relationship helps in accurately converting energy values when dealing with different systems of measurement, ensuring precise calculations in practical applications.

The other values listed do not represent the accepted conversion of calorie to joules and are inaccurate within the context of standard scientific measurements.