What is Coffee: Definition and 164 Discussions

Coffee is a brewed drink prepared from roasted coffee beans, the seeds of berries from certain Coffea species. All fruit must be further processed from a raw material—the fruit and seed—into a stable, raw product; un-roasted, green coffee. To process the berries, the seed is separated from the fruit to produce green coffee. Green coffee is then roasted, a process which transforms the raw product (green coffee) into a consumable product (roasted coffee). Roasted coffee is ground into a powder and mixed with water to produce a cup of coffee.
Coffee is darkly colored, bitter, slightly acidic and has a stimulating effect in humans, primarily due to its caffeine content. It is one of the most popular drinks in the world, and can be prepared and presented in a variety of ways (e.g., espresso, French press, caffè latte, or already-brewed canned coffee). It is usually served hot, although chilled or iced coffee is common. Sugar, sugar substitutes, milk or cream are often used to lessen the bitter taste. It may be served with coffee cake or another sweet dessert like doughnuts. A commercial establishment that sells prepared coffee beverages is known as a coffee shop (not to be confused with Dutch coffeeshops selling cannabis).
Clinical research indicates that moderate coffee consumption is benign or mildly beneficial as a stimulant in healthy adults, with continuing research on whether long-term consumption reduces the risk of some diseases, although some of the long-term studies are of questionable credibility.The earliest credible evidence of coffee-drinking as the modern beverage appears in modern-day Yemen in southern Arabia in the middle of the 15th century in Sufi shrines where coffee seeds were first roasted and brewed in a manner similar to how it is now prepared for drinking. The Yemenis procured the coffee beans from the Ethiopian Highlands via coastal Somali intermediaries, and began cultivation. By the 16th century, the drink had reached the rest of the Middle East and North Africa, later spreading to Europe.
The two most commonly grown coffee bean types are C. arabica and C. robusta. Coffee plants are cultivated in over 70 countries, primarily in the equatorial regions of the Americas, Southeast Asia, the Indian subcontinent, and Africa. As of 2018, Brazil was the leading grower of coffee beans, producing 35% of the world total. Coffee is a major export commodity as the leading legal agricultural export for numerous countries. It is one of the most valuable commodities exported by developing countries. Green, unroasted coffee is the most traded agricultural commodity, and the coffee trade is the most traded commodity second only to petroleum. Despite the sales of coffee reaching billions of dollars, those actually producing the beans are disproportionately living in poverty. Critics also point to the coffee industry's negative impact on the environment and the clearing of land for coffee-growing and water use. The environmental costs and wage disparity of farmers is causing the market for fair trade and organic coffee to expand.

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  1. T

    Recommend coffee table books

    Recommend "coffee table" books Could anyone recommend some good physics and mathematics "coffee table" books (ie. some "must reads".) I'm talking along the lines of "Uncle Petros and Goldbach's Conjecture" and "Euclid's Window".
  2. M

    Thermodynamics - heating spoon and coffee

    can someone please tell me which equation i need to use for this problem? A 50g metal spoon is placed in a cup with 200g of hot coffee. If the spoon's initial temperature is 20\circ C and the coffee's temperature is 100\circ C , what is the temperature of the spoon and coffee when their...
  3. A

    Investigating the Magnetic Properties of Coffee: A Cheap Experiment

    You can try this. Boil water in a cup, and put a teaspoon of instantaneous coffee in it. I have observed that when you do this, most of the time there is some coffee sticking to the spoon after I empty it in the cup. these particles of cofee form filaments like those that are formed by iron...
  4. A

    Why did slide rules not have the ability to do simple addition and subtraction?

    Heres something interesting I noticed the other day. I had just made a cup of coffee in a ceramic mug, and had just finished stirring it. Absent mindedly, I started picking up my spoon and dropping it into the cup at roughly half second intervals. On doing this, I noticed something very...
  5. A

    Coffee and milk (cooling/heating problem)

    coffee and milk :) (cooling/heating problem) Ok, this is supposed to be easy, but I'm just not seeing it. I've done some heating/cooling problems w/no issue, so I'm not sure why I can't do this one. My teacher posted this quickly at the end of class, and neglected to go over it next class, so...
  6. jimmy p

    Life is like a box of coffee chocolates

    Life is like a box of coffee chocolates... :frown: I need a boost. Physically and emotionally. I just have a very predictable and dull life. FACT. Nothing happens that is good, they all seem to want to spite me by being bad. My parents are splitting up. I try stay out of it as much as...
  7. J

    Sudden boiling of coffee in cup after heat source removed

    I just now heated a cup of coffee in a microwave oven for 2 minutes. When I opened the oven door to get the cup, the surface of the coffee was placid. But the moment I picked up the cup and moved it, there was a brief moment of boiling lasting maybe one second. What might have caused the...
  8. G

    Why Does the Pitch Change When Tapping a Spoon in a Cup of Spinning Coffee?

    if you stir a cup of coffee, is the velocity at the centre different from the velocity outside?
  9. U

    Introductory Interactive Online String Theory Seminar at the String Coffee Table

    I am currently beginning to conduct something like an introductory, very elementary, seminar on string theory at my local institution. The plan is to perform the whole thing in parallel on the web. The lecture notes are being published bit by bit at the String Coffee Table, namely in the...
  10. K

    Car, Coffee, and static friction

    Here is a problem from a worksheet I have..I'm having a little trouble with it. My teacher neglected to explain most of it: Now, I know everything is done in m/s, so that's 100/9 m/s. I know what the problem is asking and everything..but I don't have any formulas that I can use (I don't...
  11. S

    Is the Thermodynamics of Coffee Affected by Cream and Sugar?

    I'm doing a physics portion of an International Baccalaureate (IB) Group IV project. I'm supposed to prepare a short presentation of the thermodynamics of coffee, and I need things to talk about. IDeas I have so far: -heat dissipation, with and without the cardboard ring, of a cup of...
  12. Monique

    Is Coffee the Secret to Studying Success?

    Ok, I am in conflict. Does a bit of coffee actually help studying by increasing alertness or does it just decrease concentration?? I think I'll just use coffee to stay awake this evening and read all night long or something
  13. E

    How Many Refills Until Your Creamy Coffee Turns Black?

    You enter a diner and sit down at a booth. The diner is classic Americana... like something from the '50s... but nothing fancy. You read the morning paper and have a smoke as you wait for the waitress dressed in a not-so-clean, pink-and-white-striped, short sleave dress and white leather...
  14. D

    Electric field and coffee maker

    1) A coffe maker which draws 13.5A of current has been left on for 10 min. what is the net number of electrons that have passed thru the coffe maker. [del]Q = I * [del]T = 13.5(600) = 8.1x10^3 I got this wrong, what happened? 2) a battery is rated 12V and 160Amp-hours. How much...
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