Water finding weak paths through the coffee

Espresso Extraction Quiz: Pressure, Grind and Shot Time

This espresso extraction quiz steps behind the bar to see what turns finely ground coffee into a rich, balanced shot. Play 10 interactive questions on nine bars of pressure, water temperature, shot time, brew ratios, grind size, tamping, sour and bitter shots, channeling, crema and early espresso machines.

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🎯 Daily Trivia Challenge • 🧠 10 Questions • ⏱️ 150 Seconds

Question 1 / 10 Time: 150s

Pressure
About how much pressure do espresso machines use?
Temp
What water temperature is typical for espresso?
Time
How long does a classic shot often take?
Ratio
What is a common brew ratio for espresso?
Grind
Which grind does espresso need?
Sour
What usually causes a sour, thin shot?
Bitter
What usually causes a harsh, bitter shot?
Tamp
Why do baristas tamp the coffee?
Channel
What is channeling?
Crema
Which inventor's 1940s lever machine made crema famous?

Explanations: answer key for all 10 questions

Q1: About how much pressure do espresso machines use?
Answer: About 9 bar
That pushes water through tight coffee.
Q2: What water temperature is typical for espresso?
Answer: About 90 to 96 degrees Celsius
Too hot can taste harsh.
Q3: How long does a classic shot often take?
Answer: About 25 to 30 seconds
Timing helps diagnose problems.
Q4: What is a common brew ratio for espresso?
Answer: About 1 to 2, coffee to liquid
18 grams in, 36 grams out is one example.
Q5: Which grind does espresso need?
Answer: Fine
It creates resistance.
Q6: What usually causes a sour, thin shot?
Answer: Under-extraction
Water ran through too fast.
Q7: What usually causes a harsh, bitter shot?
Answer: Over-extraction
Water ran too long or slow.
Q8: Why do baristas tamp the coffee?
Answer: To make an even, compact bed
Even beds extract evenly.
Q9: What is channeling?
Answer: Water finding weak paths through the coffee
It causes uneven extraction.
Q10: Which inventor's 1940s lever machine made crema famous?
Answer: Achille Gaggia
High pressure created the foam.

Espresso Extraction Quiz – Pressure, Grind and Shot Time

Espresso forces hot water at about 9 bar of pressure through a compact bed of finely ground coffee. Water around 90 to 96 degrees Celsius extracts flavor in roughly 25 to 30 seconds.

Baristas often use a ratio near 1 to 2, such as 18 grams of coffee for 36 grams of espresso. Even tamping helps water flow evenly, while cracks let it rush through weak paths, a problem called channeling.

Under-extracted shots taste sour and thin, while over-extracted shots taste bitter and harsh. Achille Gaggia's lever machines of the 1940s created the golden crema that espresso drinkers still look for.

What This Quiz Teaches

Coffee lovers will enjoy these questions.

How much pressure is used
How long a shot takes
Which ratio to use
What causes sour or bitter shots
Where crema came from

Did You Know?

Fresh beans usually make more crema.
Baristas adjust grind size each day.
Ristretto is a shorter, stronger shot.
Lungo uses more water than a normal shot.
Scales help baristas stay consistent.