15 FIELD GUIDES · 2 WORKED EXAMPLES
What changes in the air?
Understand droplets, flow, water collection and optical visibility through separate measurements and explicit operating conditions.
Fog, water & atmosphere
Start with the question closest to your experiment. Each guide separates the mechanism, an illustrative example, and the evidence needed for the next decision.
Fog is liquid; humidity is vapor
Separate suspended liquid droplets from water vapor, then choose measurements that can distinguish fog collection from condensation in humid outdoor air.
Read the guide ↗FIELD GUIDEWhy a droplet average can mislead
Read a fog droplet distribution through number, area, and volume weighting to see why a few large drops can dominate liquid mass and collector response.
Read the guide ↗FIELD GUIDELiquid water content is a concentration
Use liquid water content with the sampled air volume, clear units, and uncertainty to estimate suspended water without confusing concentration with yield.
Read the guide ↗FIELD GUIDEVisibility is an optical measurement
Connect visibility to light extinction while keeping droplet size, illumination assumptions, and water content separate in a transparent optical model.
Read the guide ↗FIELD GUIDEDefine the denominator of efficiency
Distinguish incoming fog, intercepted droplets, drained water, and bottle recovery so collection efficiency has a reproducible denominator and boundary.
Read the guide ↗FIELD GUIDEFrom concentration to incoming mass flux
Calculate incoming fog-water flux from liquid water content and normal airflow, then separate the available liquid budget from a collector yield claim.
Read the guide ↗FIELD GUIDEElectric forces require a droplet model
Compare charge, electric field, drag, and residence time to understand electric droplet steering without treating field strength as a collection guarantee.
Read the guide ↗FIELD GUIDESettling competes with air motion
Estimate slow droplet settling under an explicit drag model, then compare it with air motion and residence time before predicting where fog droplets go.
Read the guide ↗FIELD GUIDEA denser mesh can divert the flow
Understand the tradeoff between collecting surface and airflow resistance by tracking pressure loss, bypass flow, wetting, and the chosen area boundary.
Read the guide ↗FIELD GUIDEAcoustic agglomeration changes encounters
Explore how sound-driven relative droplet motion can change collision opportunities while separating chamber evidence from outdoor fog-clearance claims.
Read the guide ↗FIELD GUIDEIcing changes the collector boundary
Trace how freezing droplets can change geometry, drainage, stored water, and energy accounting without treating an iced collector as steady liquid operation.
Read the guide ↗FIELD GUIDEWhere a sensor sits changes the question
Choose sensor locations that distinguish incoming conditions from device-altered flow, and use synchronized measurements to reveal spatial sampling bias.
Read the guide ↗FIELD GUIDECompare devices under shared weather
Build a fair field comparison with concurrent baselines, matched exposure, and event-level accounting so weather shifts do not masquerade as device gains.
Read the guide ↗FIELD GUIDECollected water is not automatically potable
Separate collection quantity from water quality, with intended-use testing, qualified laboratories, and clear limits on what a negative result can establish.
Read the guide ↗FIELD GUIDEEnergy per liter needs a full boundary
Calculate electricity per recovered liter with fan, field, control, and idle loads included, while distinguishing gross collection from additional water yield.
Read the guide ↗PUT THE IDEAS TO WORK