Question

How many joules are in \[148\] calories?

Answer 1

Hint:We can simply have calories into joules with the help of some basic conversions:
\[1\text{ }calorie\text{ }=\text{ }1000\text{ }calories\]
\[1\text{ }kJ\text{ }=\text{ }1000\text{ }joules\]
\[1\text{ }kilocalories\text{ }\left( kcal \right)\text{ }=\text{ }4.184\text{ }kJ\text{ }\left( kJ \right)\]
\[1\text{ }calories\text{ }=\text{ }4.182\text{ }joule/calories\]
Calories are the S.I. unit of energy.
1 calorie is required energy needed to make \[1\text{ }gm\] of water rise by \[1{}^\circ \]
According to International Units the Energy should expressed in unit Joules

Complete answer:
In order to convert to \[148\] calories into joules we already know that
\[1\text{ }calories\text{ }=\text{ }4.182\text{ }joule/calories\text{ }approx\]
Therefore, \[148\text{ }calories\text{ }\times \text{ }4.182\text{ }joule/calories\text{ }=\text{ }618.936\text{ }Joules\]


Additional Information:Also Calories are units of energy or we can say that the heat variously defines. The calorie was originally defined as amount of heat require at a pressure of $1$ standard atm to raise temperature of $1$ gram of water \[1{}^\circ C\] From the year \[1925\] this unit calorie has been defined in terms of the joule as international unit, the definition since year \[1948\] is being that the one calorie is equal to approx. $4.2$joule and because of the quantity of the heat represented by calorie is known to differ at different temperatures to around \[1\] percentage.


Note: Remember that the calories is counted for dietary reasons and that they are in fact kilocalories with the kilo in the prefix omitted in the usual scientific notations a capitalized notation Calorie is used here. In other words, if an apple is listed as having $90$ Calories, this straightforward indicates that the apple has actually \[90,000\] calories.