Question 1

How many calories are in a kilocalorie?

Accepted Answer

1 kilocalorie (kcal) equals 1,000 calories. Food labels typically show kilocalories.

Question 2

What is a BTU?

Accepted Answer

A British Thermal Unit (BTU) is the amount of energy needed to raise 1 pound of water by 1 °F. 1 BTU ≈ 1,055.06 joules.

Question 3

What is an electronvolt?

Accepted Answer

An electronvolt (eV) is the energy gained by an electron passing through a 1-volt potential difference (1.602 × 10⁻¹⁹ J). It is used in particle physics and quantum mechanics. Particle energies at the LHC reach up to TeV (10¹² eV).

Question 4

What are toe and tce?

Accepted Answer

Ton of oil equivalent (toe) = 41.868 GJ, representing the energy content of one metric ton of crude oil. Ton of coal equivalent (tce) = 29.308 GJ, for one metric ton of coal. Both are used to compare primary energy sources at a national or industrial scale.

Kilocalorie to Terajoule

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