Convert Gram square millimetres to Tonne square metres
Convert Gram square millimetres (g·mm²) to Tonne square metres (t·m²) instantly and accurately.
Conversion Formula
t·m² = g·mm² × 1.000000000e-12
About Gram square millimetres
The gram square millimetre (g·mm²) equals 10⁻⁹ kg·m², the natural unit for MEMS gyroscope resonators and micro-fabricated spinning structures. CubeSat reaction wheel rotors range 1-50 g·mm²; chip-scale IMU proof masses sit below 1 g·mm². Watchmaking balance wheels and miniature turbine blades also fall in this range. 1 g·mm² = 10⁻⁹ kg·m² = 0.01 g·cm².
About Tonne square metres
The tonne square metre (t·m²) equals 1000 kg·m², used for large industrial rotors and heavy rotating machinery. A 60-tonne paper-machine calendar roll of 0.5 m radius has I ≈7.5 t·m²; synchronous hydro-generator rotors: 50-2000 t·m²; large marine propulsion shafts: 5-50 t·m². 1 t·m² = 1000 kg·m² ≈737.6 slug·ft² ≈23 730 lb·ft².
Quick Reference Table
| Gram square millimetres (g·mm²) | Tonne square metres (t·m²) |
|---|---|
| 1 g·mm² | 1 × 10-12 t·m² |
| 2 g·mm² | 2 × 10-12 t·m² |
| 5 g·mm² | 5 × 10-12 t·m² |
| 10 g·mm² | 1 × 10-11 t·m² |
| 25 g·mm² | 2.5 × 10-11 t·m² |
| 50 g·mm² | 5 × 10-11 t·m² |
| 100 g·mm² | 1 × 10-10 t·m² |