Convert Tonne square metres to Gram square millimetres
Convert Tonne square metres (t·m²) to Gram square millimetres (g·mm²) instantly and accurately.
Conversion Formula
g·mm² = t·m² × 1000000000000
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.
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.
Quick Reference Table
| Tonne square metres (t·m²) | Gram square millimetres (g·mm²) |
|---|---|
| 1 t·m² | 1 × 1012 g·mm² |
| 2 t·m² | 2 × 1012 g·mm² |
| 5 t·m² | 5 × 1012 g·mm² |
| 10 t·m² | 1 × 1013 g·mm² |
| 25 t·m² | 2.5 × 1013 g·mm² |
| 50 t·m² | 5 × 1013 g·mm² |
| 100 t·m² | 1 × 1014 g·mm² |