The Complete Chemistry and Physics of Espresso Extraction
What you will learn
FOUNDATION
Establishes the core vocabulary and essential context you need before going further.
• Learner will be able to describe the cellulose matrix and lipid storage within the roasted coffee bean.
▶• Learner will be able to explain the Maillard reaction and caramelization as precursors to soluble compounds.
▶• Learner will be able to calculate how grind size distribution affects the total surface area available for solvent contact.
▶CORE CONCEPTS
Unpacks the ideas and principles that the subject is built on.
• Learner will be able to define the role of water chemistry and mineral content in coffee solubilization.
▶• Learner will be able to identify the sequential extraction of acids, sugars, and bitter compounds.
▶• Learner will be able to explain Fick’s laws of diffusion as they apply to solute movement from coffee grounds to water.
▶MECHANICS
Examines how things actually work — the processes, rules, and systems in action.
• Learner will be able to describe Darcy’s Law in the context of water flow through a porous coffee puck.
▶• Learner will be able to analyze how pump pressure influences the extraction time and solute concentration.
▶• Learner will be able to identify the physical causes of channeling and its effect on extraction uniformity.
▶APPLICATION
Puts knowledge to use through real-world scenarios and practical problems.
• Learner will be able to explain how temperature affects the solubility constant of coffee compounds.
▶• Learner will be able to describe the formation of the espresso crema as a gas-liquid colloidal system.
▶• Learner will be able to explain the role of CO2 in espresso extraction and crema structure.
▶SYNTHESIS
Connects everything together and explores broader implications and open questions.
• Learner will be able to categorize key volatile compounds responsible for the sensory profile of espresso.
▶• Learner will be able to explain the relationship between total dissolved solids (TDS) and the viscosity of espresso.
▶• Learner will be able to synthesize physical and chemical variables to optimize an extraction recipe.
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