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The relationship between diffuser capacity and spray range isn't as straightforward as you might expect - it's not simply "bigger capacity equals wider range."
Capacity primarily affects duration, not range A diffuser's capacity (how much oil/water it holds) mainly determines how long it can operate before needing a refill. A 300ml diffuser will run longer than a 100ml one at the same output rate, but won't necessarily cover a larger area.
Spray range depends on other factors:
Mist output rate - measured in ml/hour, this determines how much fragrance gets dispersed per unit time
Particle size - finer mist travels farther and stays airborne longer
Fan strength or ultrasonic power - affects how forcefully mist gets propelled
Nozzle design - influences spray pattern and direction
The practical relationship: Larger capacity diffusers often do have greater range, but that's because manufacturers typically pair bigger tanks with more powerful motors, stronger fans, or multiple misting heads - not because of the capacity itself. A high-end 500ml diffuser might cover 1000+ square feet, while a basic 100ml model covers 200-300 square feet, but this correlation exists because larger models are usually designed for bigger spaces with more robust dispersal mechanisms.
What really matters for coverage:
Look for specifications like "coverage area" or "room size" rather than just capacity
Higher mist output rates (ml/hour) generally mean better range
Multiple misting outlets can improve distribution
Placement and room ventilation significantly impact effective range
So while capacity and range often correlate in commercial products, capacity alone doesn't determine how far your diffuser's fragrance will reach.