A fuel sample from a Boeing 737 shows water droplets at the bottom. Is this a compound issue or a mixture issue, and what action fits the concept?

Answer	This is a mixture issue: water and fuel are physically mixed but not chemically bonded. You can often separate it by draining/sumping because it’s not a chemical bond you need to break. WHY IT MATTERS: It supports correct contamination handling and prevents icing or engine issues. AIRCRAFT EXAMPLE: Fuel tank sump drains remove water because it settles due to density difference. MEMORY AID: Mixture = separable (often). EASA TIP: Exam trick: water-in-fuel is a mixture; water itself is a compound.
Difficulty	Hard
Lesson	2.1.1 Nature of Matter
Module	Module 2.1
Tags	HardMixturesModule 2.1