Caffeine

Definitions

An alkaloid, C₈H₁₀N₄O₂, found naturally in tea and coffee plants, which acts as a mild stimulant on the central nervous system.

uncountable, usually

Equivalents

Examples

“For example, 0.100 grams of caffeine yield⟳ by combustion, by weight, 0.180 grammes of carbonic acid.”

“Hitherto, in consequence of its slight solubility, caffeine has been administered hypodermically only in very small doses ; in fact, at the ordinary temperature, it requires 93 parts of water to dissolve, so that a cubic centimeter would contain⟳ scarcely more than a centigram.”

“The US Food and Drug Administration defines this limit⟳ as anything more than 400 milligrams of caffeine daily for healthy adults. This is equivalent to four or five cups of coffee.”

CEFR level