ton, a unit of weight equal to 2,240 lb avoirdupois (1016.05 kg).
tonne, a metric ton.
'The tonnage of bombs dropped on Vietnam was more than that of WW2 and Korea.' When 'tonnages' are not specified like this there is doubt about what they amount to, and I'm strenuously engaged with the problem of thinking in terms of 'tons' or 'tonnes'.
Can anybody help me in understanding whether is better to think in terms of 'tons' rather than in terms of 'tonnes'?