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. fluidistic

    Coffee. Yes coffee. Do you really feel a difference ?

    Coffee. Yes coffee. Do you really "feel a difference"? Instead of pointlessly debating whether caffeine affects our body (which it does of course), I want to know whether you really "feel a difference" when you drink coffee. Does it prevent you from sleeping? Can you stay concentrated on your...
  2. CFDFEAGURU

    Favorite Coffee Shop Closing

    There is a great little coffee shop near my house that I have done a lot of programming work there while drinking their wonderful coffee and now it is closing. The only places to choose from now are Starbucks and Dunk'n Donuts. The chain places are just not the same ... Has anyone else lost...
  3. S

    A thermal physics question about steam and coffee, please could you help?

    Homework Statement A coffee machine in a café passes steam at 100°C into 0.18kg of cold coffee (s.h.c. the same as that of water(4200j/kg/K)) to warm it. If the initial temperature of the coffee is 14°C, what mass of steam must be supplied to raise the temperature of the coffee to 85°C Homework...
  4. K

    Heat transfer of a cup of coffee

    does a cup of coffee, say 85 degrees C in a 20 degree C room, lose more heat due to radiation or conduction. In general, do common objects lose more heat due to radiation vs. conduction?
  5. M

    Vaporisation of coffee in a sealed cup

    Just wondering - if you have one of those cups of coffee with a lid on it, how much of the liquid would evaporate (assuming reasonable figures for the size of the cup and temperature of the liquid or whatever other variables are relevant)? Since it's essentially a sealed container, I'd assume...
  6. R

    Medical Can coffee improve mental function?

    I find whenever I drink coffee that has a bit too much caffeine in it I become rather jittery and full of energy, also my heart speeds up. There isn't anything new and exciting about that. What I do have a question about is that fact that minutes after I drink it and maybe for the next hour...
  7. zoobyshoe

    Medical Coffee Decreases Risk of Death

    http://www.npr.org/blogs/thesalt/2012/05/16/152835058/can-coffee-help-you-live-longer-we-really-want-to-know
  8. A

    Thermodynamics: Pouring Cream into Coffee

    I did a general problem of the perfect time to pour cream into coffee. I was hoping someone could check my work It's in the pdf below: docs(dot)google(dot)com/open?id=0Bx8zdkF5WYAbMl80UjI5U2lmdlU Thanks
  9. T

    Newton's Law of cooling DE involving delicious coffee.

    I did this problem a few times now and double checked my procedure but I don't see what I did wrong. The answer should be 6.07 minutes according to the back of the book, but I get 3.63. Homework Statement Newton's law of cooling states that the temperature of an object changes at a rate...
  10. B

    Job interview question: 2 glasses of coffee (Heat Transfer)

    I tried searching for this but i couldn't find an answer so i hope this is hasn't been discussed and if so - sorry- and id appreciate a link.. Here we go: Lets say we have to glasses, A and B. In glass A we pour boiling water and add milk straight afterwards. Now for glass B we pour the...
  11. K

    When Should You Add Milk to Coffee for Optimal Temperature at Drinking Time?

    Homework Statement The coffee in a cup is at a temperature T(to) when t=to in a room that has temperature T1=20 degrees Celsius. The temperature of the coffee is found using the function: T(t) = (T(t_0) - T_1) e^{(-\frac{t-t_0}{10})} + T_1 , t >= t_0 We add milk, so that the cup contains 90%...
  12. D

    Nickel in Coffee Cup Calorimeter (Small Error)

    Homework Statement nickel weights 28.2g and is heated to 100°C 150g water at 13.5°C After the nickel is placed in the water, the final temperature of the metal and water is 25°C. Find the specific heat capacity of nickel Homework Equations Q=mcΔT The Attempt at a Solution...
  13. C

    What is the Most Effective Angle for Blowing on Hot Coffee to Cool it Down?

    My friends and I were curious as to what the best angle was to blow on coffee to cool it down (actually only the coffee near the surface cools, so that's where we measured) We did three trials each for 0°, 30°, 45°, 60°, 75°, and 90°.. all started around 88°C to 91°C measured every 30 seconds...
  14. B

    How to Calculate Heat Produced by a Coffee Cup Calorimeter Reaction?

    Homework Statement The reaction of 0.050 g of solid Mg with 100.0 mL of 1.00M aqueous HCl solution is carried out in a coffe-cup calorimeter. The temperature of the solution increases from 22.21 degrees Celsius to 24.46 degrees Celsius. How much heat is produced by the reaction? Homework...
  15. J

    Change in coffee taste under certain conditions - chemical explanation?

    I'm just wondering if someone can point me in the right direction here.. or maybe I'm just crazy lol. I'm a big coffee drinker. When I go out, I usually grab a coffee and walk around with it in hand. (mall's, convenience stores, book stores, subways and buses etc...) and as expected there is...
  16. BobG

    Finland #1 in coffee consumption?

    How can that be? And how can the United States rank a lowly #27 in coffee consumption per capita?! Finns drink nearly three times more coffee than Americans! I try and try to increase the coffee consumption per capita in the US, but I'm only one person! I can only drink so much coffee...
  17. N

    Determining which coffee has a greater rate of cooling

    Hey, I have this math investigation task which asks us to model the cooling of coffee in three different cups over a period of time. Anyway, i got the data, did a scatter plot and found the exponential model, but i don't know how i could determine which one has the greatest rate of cooling. I...
  18. Ivan Seeking

    Coffee Shopping: Price, Quality, and Oregon Standards

    What coffee do you buy and what do you pay for it? We used to drink Millstone's French Roast, but when we started paying $1 per ounce at Safeway, I'd had enough. I think they kept shrinking their bags and we never noticed. The next thing I knew, a 10 oz bag was ~$10! It's good but not THAT...
  19. G

    Bomb calorimeter and coffee cup calorimeter

    What is different between a bomb calorimeter and a coffee cup calorimeter that makes one only constant volume and the other only constant pressure? to me, it seems that both of them should have constant volume because they are both closed containers... and why is the pressure in a coffee...
  20. T

    Coffee How much coffee do you drink?

    I'm just curious as to how many people here drink coffee and if so, how much. (I consider a 'cup' to be your average mug, or like an average large/extra large coffee at a coffee shop. It's a very rough measurement.) I know coffee is very prominent among science/math majors (I've noticed that...
  21. Evo

    Coffee, Sex, Exercise Among Triggers for Ruptured Brain Aneurysm

    If it's not one thing, it's another... continued... http://news.yahoo.com/s/usnews/20110506/ts_usnews/healthbuzzcoffeesexincreaseaneurysmrisk
  22. C

    Heating 5.0dl of Coffee Water: How long does it take?

    Homework Statement Coffee maker, whose output of 650 W, producing coffee. Kettle to the boil 5.0 dl of water, with an initial temperature of 14 ° C. Heat capacity of water is 4.19 kJ / (kg ° C) and water density of 1.0 kg/dm3 Homework Equations How long does it take a coffee water...
  23. P

    Is there any specific name for a coffee cup handle in mathematics?

    is there any specific name for a coffee cup handle in mathematics?
  24. W

    Bubbles in a cup of coffee why does this happen?

    So I just sat down at my computer with a cup of coffee before I start doing some work.. I noticed that when I dip the tip of my pencil (it is a mechanical pencil with a plastic end) in the coffee, bubbles are attracted to the tip of it. Literally, I can put the tip up to 1cm away, and the...
  25. E

    ENIGMA: Why put a glass rod in coffee cup?

    Hello All, One of my science teachers puts a glass rod in his coffee, but he won't tell us why... I was wondering if there was a physic/chemistry related explanation to this. He said that the effect did not occur before when he didn't put it in. Adding the glass rod ''solved the...
  26. Ivan Seeking

    Why is coffee so important to me?

    No coffee?! This morning, the unthinkable happened: I was out of coffee! To the best of my recollection, this was my first conscious day [as opposed to, surgery days, severe illness, exhaustion] without coffee in 30 years. It is probably one of a few days that I've gone without coffee in...
  27. J

    Coffee Filter Lab: Finding Air Resistance & Terminal Velocity

    Homework Statement We dropped coffee filters from 4.39 M recording the time it took for them to fall, and their masses as followed. 1 Filter- Mass= .86G, Time it took to hit the ground= 3.94s 2 Filters- Mass= 1.76g, Time it took to hit the ground= 3.25s 3 Filters- Mass= 2.72g, Time it took...
  28. C

    Nerdcore & decaff coffee, & typing in gloves

    What's a gal to do?! I can't concentrate on my study, for whatever reason, I'm dying for coffee I can't have & have to type with my gloves on! (Raynaud's is annoying!) Nerdcore is soothing me though, bit of Nursehella & MC Hawking. Any tips for getting over that "can't be arsed" unmotivated...
  29. M

    A general curve for the coffee cup problem.

    This isn't really homework but my homework made me wonder about this. Any good links to formulas, graphs etc would help make my calc homework unnecessarily accurate. I'm in a calc class we've been getting problems that require us to graph the temperature of a hot coffee cup as it sits on a...
  30. F

    Coffee cup calorimetry experiment

    Homework Statement Simple Coffee cup Calorimetry. Heat capacity of calorimeter was measured experimentally. Mg ribbons dissolved in aq HCl in coffee cup calorimeter and measurements taken. MgO was then dissolved in another setup of identical calorimeter and measurements taken. My...
  31. J

    Walnut Coffee Table: Don't Overpay!

    http://sfbay.craigslist.org/sby/fuo/1893384577.html" The mistake the seller did is, (s)he cut pasted the description from the original. A google search of the description shows the item price is $188. http://www.overstock.com/Home-Garden/Incline-Walnut-Coffee-Table/4717584/product.html"...
  32. H

    What's Your Favorite Way to Enjoy Coffee?

    I think we got a lot of serious coffee-drinkers here, so I´d like to know.. http://forum2.mobile-review.com/images/smilies/smile.gif for me, strong (! http://forum2.mobile-review.com/images/smilies/biggrin.gif )[/URL] and some milk in it - I´m happy..! Just got...
  33. F

    Inhalable coffee created, math geeks rejoice

    not my thing but maybe other people on here will be into it: http://www.huffingtonpost.com/2010/03/16/le-whif-breathable-coffee_n_501568.html
  34. B

    Discover the Best Way to Cool Your Coffee in Just 5 Minutes: Milk vs. No Milk

    "This famous problem is always interesting. Suppose you want to make your morning coffee cool off within five minutes to make it a more suitable temperature. Do you pour the cold milk first and then wait five minutes before drinking, or d you wait five minutes before adding the milk?" I...
  35. EnumaElish

    Decent Decaf Coffee: Find Your New Year Fave with ROASTe.com

    Happy new year! I'm ISO decent decaf coffee that I can order over the Internet (or phone), or buy in supermarkets. For me it's relatively uncomplicated to find quality regular coffee -- the Caribou blend is one. As for decaf, I became hooked on a coffee shop brand that I tried years ago, and...
  36. A

    Newton's Law of Cooling of coffee

    Homework Statement Suppose that a cup of hot coffee at a temperature of 1850 is set down to cool in a room where the temperature is kept at 700. What is the temperature of the coffee 10 minutes later? Homework Equations f(t)=(T0 - T1))e-kt + T1 where T0 is the initial temperature of the...
  37. C

    Calculating Force T on Tray with Food and Coffee

    Homework Statement The mass of the tray itself is 0.187 kg, and its center of gravity is located at its geometrical center. On the tray is a 1.31 kg plate of food and a 0.300 kg cup of coffee. Assume L1 = 0.0610 m, L2 = 0.130 m, L3 = 0.224 m, L4 = 0.365 m and L5 = 0.387 m. Obtain the...
  38. N

    The rate at which the coffee is cooling

    Homework Statement The temperature, H, in degrees Celsius, of a hot cup of coffee placed on the kitchen counter is given by H=f(t), where t is in minutes since the coffee was put on the counter. Is f'(t) positive or negative? What are the units of f'(20)? What is its practical...
  39. J

    Coffee grains are hard to clean up

    Inspired by the recent thread on flying coffee grains I felt the urge to ask if anyone knows why coffee is so darn hard to clean up? It doesn't stick to the rag as most substances do. I'm assuming it has something to do with the grains' surface structure, but what kind of physics describes this?
  40. R

    Why do coffee grounds fly out of the grinder?

    Every morning I put whole coffee beans in a small electric coffee mill, fit the cover into the mill and pulverize the beans. Then – no matter how carefully I try to avoid it – when I take the cover off and decant the ground-up coffee into the coffee pot, a thin layer of coffee grinds ALWAYS ends...
  41. T

    Solving for Ice: Coffee Cooling With Heat Exchange

    Homework Statement You are given 2.5 102 g of coffee (same specific heat as water) at 70.0°C. In order to cool this to 60.0°C, how much ice (at 0.0°C) must be added? Neglect heat content of the cup and heat exchanges with the surroundings. Homework Equations Q=(m ice)(c ice)(delta T...
  42. J

    How can the owners maximize profits by pricing their coffee beans effectively?

    Homework Statement Mocha beans are priced at X dollars per pound, and Kona beans at y dollars per pound. 80 - 100x + 40y pounds of Mocha beans sold each week 20 + 60x -35y Kona beans sold each week. Cost of the beans is $2 per lbs of Mocha and $4 of Kona beans to the owners. How should the...
  43. A

    How long will it take for coffee to reach the perfect temperature

    Homework Statement 4. Your half- finished cup of coffee has cooled down to a temperature Tc. You like your coffee to be at the perfect temperature Tp. You put your cup, containing x mL of coffee, into the microwave. Assume 1mL of coffee has a mass of 1g. a. How much energy will it take to...
  44. M

    Temperature and Thermal Energy of coffee cup

    Before I begin, Please note that for some reason I don't really grasp physics equations which is odd since I had a A in chemistry but physics just confuses me and also, I am taking this class to prepare me for college. My pencil broke and I didn't think we would have homework of the stuff we...
  45. A

    Can I Use Cafe Bustelo in My Mr. Coffee for Espresso?

    OK, I'm a coffee noob so try not to laugh too hard. If I put this Cafe Bustelo in my little 4-cup Mr. Coffee, will it come out tasting awful? I'm not sure if 'espresso' refers to the blend or how finely the coffee is ground. Also, what do youse guys use for a coffee travel mug? I tried...
  46. L

    Air Resistance of coffee filter

    Homework Statement You drop a single coffee filter of mass 1.4 grams from a very tall building, and it takes 47 seconds to reach the ground. In a small fraction of that time the coffee filter reached terminal speed. a) What was the upward force of the air resistance while the coffee filter...
  47. T

    Which is Better When Feeling Tired: Coffee or a Nap?

    If you had the choice between drinking coffee or taking a short nap when feeling (a little) tired which would you think is the best, provided time is not an issue? A little is used because if you were extremely tired then a nap is the way to go. The question is another way of saying which is...
  48. J

    Coffee & Memories: Reflecting on my Father's Saturdays

    There's a new Dunkin' Donuts shop opening up about a mile from my house. That will be the 4th one within 5 miles. It's a doughnut shop, but I think of it as a coffee shop because my wife sends me out for coffee every Saturday and Sunday morning. There are Starbucks in the area too, but she says...
  49. G

    Medical What's responsible if you feel no reward from alcohol, coffee, ?

    I was wondering where the addictive effect from alcohol and coffee comes from in the brain? I personally do not feel any "positive" effect what so ever from alcohol (cheer up, lose inhibitions, more talkative, ...) or coffee (stimulating). There are "consumption unrelated" things that do that...
  50. Aquafire

    Investigating the Phenomenon of Milk and Coffee Stirring

    Milk Please..! Part of my early morning ritual involves making myself a nice cup of coffee. I pour my aromatic brew into the cup and then add a little sugar. In the process of getting the sugar to dissolve, I give the contents a clockwise stir, turning the teaspoon, (not too vigorously...
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