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Barron states that 4.18×10⁸ joules equal 1 kcal, is this correct?
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$begingroup$
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
edited 15 mins ago
Loong♦
34.7k887185
asked 6 hours ago
Luke KongLuke Kong
212
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.
$endgroup$
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
edited 15 mins ago
Loong♦
34.7k887185
asked 6 hours ago
Luke KongLuke Kong
212
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♦
18 mins ago
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
edited 15 mins ago
Loong♦
34.7k887185
asked 6 hours ago
Luke KongLuke Kong
212
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.
$endgroup$
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
energy units erratum
edited 15 mins ago
Loong♦
34.7k887185
asked 6 hours ago
Luke KongLuke Kong
212
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 15 mins ago
Loong♦
34.7k887185
asked 6 hours ago
Luke KongLuke Kong
212
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 15 mins ago
Loong♦
34.7k887185
edited 15 mins ago
Loong♦
34.7k887185
edited 15 mins ago
Loong♦
34.7k887185
34.7k887185
asked 6 hours ago
Luke KongLuke Kong
212
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 6 hours ago
Luke KongLuke Kong
212
asked 6 hours ago
Luke KongLuke Kong
212
212
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.
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.
$begingroup$
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♦
18 mins ago
add a comment |
$begingroup$
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♦
18 mins ago
$begingroup$
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♦
18 mins ago
$begingroup$
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♦
18 mins ago
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
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 $pu{4.18e6 J}$, and maybe Barron's is now suggesting an "extra large" calorie.
More likely it is just a typo.
edited 1 hour ago
Melanie Shebel♦
3,50373273
answered 6 hours ago
Karsten TheisKarsten Theis
6,155947
$endgroup$
add a comment |
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1 Answer
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1 Answer
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active
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$begingroup$
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 $pu{4.18e6 J}$, and maybe Barron's is now suggesting an "extra large" calorie.
More likely it is just a typo.
edited 1 hour ago
Melanie Shebel♦
3,50373273
answered 6 hours ago
Karsten TheisKarsten Theis
6,155947
$endgroup$
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 $pu{4.18e6 J}$, and maybe Barron's is now suggesting an "extra large" calorie.
More likely it is just a typo.
edited 1 hour ago
Melanie Shebel♦
3,50373273
answered 6 hours ago
Karsten TheisKarsten Theis
6,155947
$endgroup$
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 $pu{4.18e6 J}$, and maybe Barron's is now suggesting an "extra large" calorie.
More likely it is just a typo.
edited 1 hour ago
Melanie Shebel♦
3,50373273
answered 6 hours ago
Karsten TheisKarsten Theis
6,155947
$endgroup$
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 $pu{4.18e6 J}$, and maybe Barron's is now suggesting an "extra large" calorie.
More likely it is just a typo.
edited 1 hour ago
Melanie Shebel♦
3,50373273
answered 6 hours ago
Karsten TheisKarsten Theis
6,155947
edited 1 hour ago
Melanie Shebel♦
3,50373273
edited 1 hour ago
Melanie Shebel♦
3,50373273
edited 1 hour ago
Melanie Shebel♦
3,50373273
3,50373273
answered 6 hours ago
Karsten TheisKarsten Theis
6,155947
answered 6 hours ago
Karsten TheisKarsten Theis
6,155947
answered 6 hours ago
Karsten TheisKarsten Theis
6,155947
6,155947
add a comment |
add a comment |
Luke Kong is a new contributor. Be nice, and check out our Code of Conduct.
Luke Kong is a new contributor. Be nice, and check out our Code of Conduct.
Luke Kong is a new contributor. Be nice, and check out our Code of Conduct.
Luke Kong is a new contributor. Be nice, and check out our Code of Conduct.
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$begingroup$
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♦
18 mins ago