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Barron states that 4.18×10⁸ joules equal 1 kcal, is this correct?

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2

$begingroup$

Here is a paragraph in Barron's SAT chemistry prep book:

Work itself is measured in Joules, and so is energy. In some problems, however, energy may be expressed in kilocalories. The relationship between these two units is that $4.18times10^8$ Joules equals 1 kilocalorie (kcal).

Is this correct? Isn't 1 kilocalorie 4180 Joules?

energy units erratum

share|improve this question

edited May 19 at 6:38

Loong♦

34.7k887187

asked May 19 at 0:37

Luke KongLuke Kong

192

New contributor

Luke Kong is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Also note that names of units such as ‘joule’ are spelled with a lower case initial in English. (For SI units, it is only the unit name ‘degree Celsius’ that contains a capital letter.)
  $endgroup$
  – Loong♦
  May 19 at 6:35
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  $begingroup$
  It's likely just 3 being mistaken for 8 by typesetter as they are similar in some fonts and handwritings.
  $endgroup$
  – Džuris
  May 19 at 9:06
  

  
  
  
  

add a comment | 

2

$begingroup$

Here is a paragraph in Barron's SAT chemistry prep book:

Work itself is measured in Joules, and so is energy. In some problems, however, energy may be expressed in kilocalories. The relationship between these two units is that $4.18times10^8$ Joules equals 1 kilocalorie (kcal).

Is this correct? Isn't 1 kilocalorie 4180 Joules?

energy units erratum

share|improve this question

edited May 19 at 6:38

Loong♦

34.7k887187

asked May 19 at 0:37

Luke KongLuke Kong

192

New contributor

Luke Kong is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Also note that names of units such as ‘joule’ are spelled with a lower case initial in English. (For SI units, it is only the unit name ‘degree Celsius’ that contains a capital letter.)
  $endgroup$
  – Loong♦
  May 19 at 6:35
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  $begingroup$
  It's likely just 3 being mistaken for 8 by typesetter as they are similar in some fonts and handwritings.
  $endgroup$
  – Džuris
  May 19 at 9:06
  

  
  
  
  

add a comment | 

$begingroup$

Here is a paragraph in Barron's SAT chemistry prep book:

Work itself is measured in Joules, and so is energy. In some problems, however, energy may be expressed in kilocalories. The relationship between these two units is that $4.18times10^8$ Joules equals 1 kilocalorie (kcal).

Is this correct? Isn't 1 kilocalorie 4180 Joules?

energy units erratum

share|improve this question

edited May 19 at 6:38

Loong♦

34.7k887187

asked May 19 at 0:37

Luke KongLuke Kong

192

New contributor

Luke Kong is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

share|improve this question

edited May 19 at 6:38

Loong♦

34.7k887187

asked May 19 at 0:37

Luke KongLuke Kong

192

New contributor

Luke Kong is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited May 19 at 6:38

Loong♦

34.7k887187

asked May 19 at 0:37

Luke KongLuke Kong

192

New contributor

Luke Kong is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited May 19 at 6:38

Loong♦

34.7k887187

edited May 19 at 6:38

Loong♦

34.7k887187

asked May 19 at 0:37

Luke KongLuke Kong

192

New contributor

Luke Kong is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked May 19 at 0:37

Luke KongLuke Kong

192

1 Answer
1

active

oldest

votes

8

$begingroup$

This should never have happened in the scientific community, but:

The energy values of food are measured by the Calorie, with a capital C. A Calorie is equal to 1,000 calories or 1 kilocalorie (kcal).

Source: here

It is possible that Barron's got confused between Calorie and calorie. Even so, they still would be off by a factor of 100.

According to Wikipedia:

The SI unit of energy is the joule, with symbol "J"; one small calorie is now defined as exactly 4.184 J, and one large calorie is 4184 J. However, the two units are still used occasionally in technical work, and the large calorie is still widely used in nutrition.

So you are correct in saying that 1 "small" kilocalorie is 4180 joules. 1 "large" kilocalorie is $pu4.18e6 J$, and maybe Barron's is now suggesting an "extra large" calorie.

More likely it is just a typo.

share|improve this answer

edited May 19 at 5:48

Melanie Shebel♦

3,53573273

answered May 19 at 0:52

Karsten TheisKarsten Theis

6,3711048

$endgroup$

add a comment | 

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8

$begingroup$

This should never have happened in the scientific community, but:

The energy values of food are measured by the Calorie, with a capital C. A Calorie is equal to 1,000 calories or 1 kilocalorie (kcal).

Source: here

It is possible that Barron's got confused between Calorie and calorie. Even so, they still would be off by a factor of 100.

According to Wikipedia:

The SI unit of energy is the joule, with symbol "J"; one small calorie is now defined as exactly 4.184 J, and one large calorie is 4184 J. However, the two units are still used occasionally in technical work, and the large calorie is still widely used in nutrition.

So you are correct in saying that 1 "small" kilocalorie is 4180 joules. 1 "large" kilocalorie is $pu4.18e6 J$, and maybe Barron's is now suggesting an "extra large" calorie.

More likely it is just a typo.

share|improve this answer

edited May 19 at 5:48

Melanie Shebel♦

3,53573273

answered May 19 at 0:52

Karsten TheisKarsten Theis

6,3711048

$endgroup$

add a comment | 

8

$begingroup$

This should never have happened in the scientific community, but:

The energy values of food are measured by the Calorie, with a capital C. A Calorie is equal to 1,000 calories or 1 kilocalorie (kcal).

Source: here

It is possible that Barron's got confused between Calorie and calorie. Even so, they still would be off by a factor of 100.

According to Wikipedia:

The SI unit of energy is the joule, with symbol "J"; one small calorie is now defined as exactly 4.184 J, and one large calorie is 4184 J. However, the two units are still used occasionally in technical work, and the large calorie is still widely used in nutrition.

So you are correct in saying that 1 "small" kilocalorie is 4180 joules. 1 "large" kilocalorie is $pu4.18e6 J$, and maybe Barron's is now suggesting an "extra large" calorie.

More likely it is just a typo.

share|improve this answer

edited May 19 at 5:48

Melanie Shebel♦

3,53573273

answered May 19 at 0:52

Karsten TheisKarsten Theis

6,3711048

$endgroup$

add a comment | 

$begingroup$

This should never have happened in the scientific community, but:

The energy values of food are measured by the Calorie, with a capital C. A Calorie is equal to 1,000 calories or 1 kilocalorie (kcal).

Source: here

It is possible that Barron's got confused between Calorie and calorie. Even so, they still would be off by a factor of 100.

According to Wikipedia:

The SI unit of energy is the joule, with symbol "J"; one small calorie is now defined as exactly 4.184 J, and one large calorie is 4184 J. However, the two units are still used occasionally in technical work, and the large calorie is still widely used in nutrition.

So you are correct in saying that 1 "small" kilocalorie is 4180 joules. 1 "large" kilocalorie is $pu4.18e6 J$, and maybe Barron's is now suggesting an "extra large" calorie.

More likely it is just a typo.

share|improve this answer

edited May 19 at 5:48

Melanie Shebel♦

3,53573273

answered May 19 at 0:52

Karsten TheisKarsten Theis

6,3711048

$endgroup$

share|improve this answer

edited May 19 at 5:48

Melanie Shebel♦

3,53573273

answered May 19 at 0:52

Karsten TheisKarsten Theis

6,3711048

edited May 19 at 5:48

Melanie Shebel♦

3,53573273

edited May 19 at 5:48

Melanie Shebel♦

3,53573273

answered May 19 at 0:52

Karsten TheisKarsten Theis

6,3711048

answered May 19 at 0:52

Karsten TheisKarsten Theis

6,3711048