DANIEL SAMBRAUS / SCIENCE PHOTO LIBRARY DANIEL SAMBRAUS / SCIENCE PHOTO LIBRARY
Instant coffee dissolving in water. Instant coffee is a dried aqueous solution of roasted coffee. The drying process produces hollow particles of low density by either spray-drying or freeze-drying. The dry powder is added to water to rehydrate it and produce coffee. Coffee, from the beans of the Coffea sp. plant, contains the stimulant drug caffeine.
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