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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
  1. Dimensions are given as diameters for spheres and as length for the ‘link’. The Marimo ball has a weight of 88mN once desiccated