Table 1 The density and related buoyancy of various materials and Marimo
From: Marimo machines: oscillators, biosensors and actuators
Part | Material | Density | Diameter (Length) ∗ | Weight | Buoyancy |
|---|---|---|---|---|---|
g cm −3 | mm | mN | mN | ||
Float (sphere) | Polypropylene (PP) | ~0.9 | 25.4 | 71 | 7.8 |
Marimo (sphere) | Filamentous algae | ~1.0 | 50 – 60 | 520†| -4.9 |
Bubbles | Gas (O2, CO2 & N2 mix) | 0.001 | 0 – 5 | 0 | 0 – 20 |
Weight (sphere) | Polyoxymethylene (Delrin®) | 1.42 | 11 | 9.0 | -2.6 |
Link ∗ | Nichrome wire | 8.4 | (75) | 1.5 | -1.3 |
Combined Overall | − 1 t o + 1 9 |