# How many joules are in 1 kcal?

1 calorie is 4.1868 joules. This is referred to (or was when I was at school a long time ago) as the 'mechanical equivalent of heat' and is worth remembering, you can say 4.2 joules to a good approximation.

So 1 kcal = 4,186.8 joules or 4.1868 kjoules if you prefer

### Which properties should one measure in order to differentiate between two isomers?

The two main units of Energy are the Joule and the Calorie. The Joule is normally represented as the KiloJoule (kJ), which is equivelent to 1000 J. The Calorie is represented as Kcal. 2000 Kcal (calories) is given as the Guideline Daily Allowance for most adults. 1 calorie = 4.184 J or equivalently, 1 kcal = 4.184 kJ Google calculator: http://www.google.com/search?q=1+calorie+in+joules&btnG=Search Wiki Joule entry: http://en.wikipedia.org/wiki/Joule Wiki Calorie entry: http://en.wikipedia.org/wiki/Calorie

### Is there a difference between kcal and calorie?

No there's not. Except on the back of food packets it is called Kcal's instead of calories. This answer is wrong. A food, or dietary Calorie is equal to 1000 calories, which is 1 Kcal (kilocalorie). A capital C is also used to designate a Kcal, or 1000 small calories. A small calorie is designated by a small c, and is equal to the amount of heat required to raise the temperature of 1 cubic…

### How many calories in a packet of sugar?

There are 3.87 kcal per gram of sugar, so the answer depends on the size of the sugar packet, which is apparently not standard. Packets tend to vary from 2-6 grams. According to the USDA website, they list 2.8g packet = 11 kcal Which would yield 16 kcal/ 4.2g teaspoon, and ~23 kcal/6g packet. Examples: "Sugar in the raw" brand has 5g = ~19 kcal Domino brand packets have 4g = ~15 kcal

### How do you convert calories to kcal?

k signifies "multiplied by one thousand", so 1000 calories is one kcal. Note, however, that dietetic "Calories" are already equivalent to kcals. They are actually exactly the same. kcal is kilocalories. Sometimes the term Calories is also used with "C" in uppercase. Both are correct and 1 kcal = 1 Cal. When we loosely say 1 Calorie, actually we mean 1 kilocalorie.

### How many kWh are needed to produce 1 kcal?

1 kilocalorie = 4186.8 joules, and 1 joule/sec = 1 watt. So 1 kwh = 1000 x 3600 watt.secs = 3.6 x 106 joules. So answer = 4186.8/(3.6 x 106) = 1.163 x 10-3 kwh. This could also be expressed as 4.2 kwsec You could check this directly using an electric kettle. Put in 1 liter of water (1 Kilocalorie will heat this by 1 deg celsius) Note the kettle wattage, and the cold water…

### How many calories are in one sugar packet?

10 - 20 calories per packet There are 3.87 kcal per gram of sugar, so the answer depends on the size of the sugar packet, which is apparently not standard. Packets tend to vary from 2-6 grams. According to the USDA website, they list 2.8g packet = 11 kcal Which would yield 16 kcal/ 4.2g teaspoon, and ~23 kcal/6g packet. Examples: "Sugar in the raw" brand has 5g = ~19 kcal Domino brand packets have…