1. Aviation System
Airways: Invisible path in the sky, pilots follow the predetermined routes
Departure:
- At the gate
- Taxis to the runway
- Get clearance from air traffic control
- Take off
Landing:
- Follow a descent path
- Get clearance to land
- Lands
- Taxis to its gate
Traffic rule:
- Right-of-way rules
- General rules
- Non powered > powered
- Balloons > non-powered
- Distress aircraft >
- Converging: the right has the right-of-way
- Overtaking: aircraft being overtaken has the right-of-way
- Head-on: both alter to the right
- Landing: lower altitude
- General rules
- Altitude assignments to prevent collisions
- Speed limits
- Rules for navigating around bad weather
Communication: use radio to communicate with air traffic control and other aircraft
Navigation: use GPS and VORs (Very High Frequency Omnidirectional Range.)
2. Chlorine turn Black to Red
- Chemical reaction between the fabric dye and the chemical in the pool, especially chlorine, known for bleaching effect
- pH level
3. Essential Oil
Concentrated plant extract, retain natural smell and flavor
Production
- Extraction
- Distillation: most common, steamed, and cooled to separate the oil and water
- Cold pressing
- Solvent extraction
- CO2 extraction