1, time is one of the seven basic units in mathematics and physics, with the symbol T. In the international system of units (SI), the basic unit of time is seconds, with the symbol S, and sometimes it is marked with English abbreviations as sec.

2. Ton is often used as the unit of mass in mathematics and physics, and the symbol is lowercase t .. One metric ton is equal to 1000 kg.

In the international system of units, the basic unit of mass is kilogram, and the symbol is kilogram. 1t= 1000kg. It was originally stipulated that the mass of pure water with 1000cm (i.e. 1dm) was 1Kg at 4℃.

Extended data:

Time unit conversion relationship:

1 year = 12 months (flat year and leap year 13 months); 1 quarter =3 months; 1 week =7 days; 1 day =24 hours; 1 hour =60 minutes; 1 min =60 seconds.

Commonly used mass units are: microgram (ug), milligram (mg), gram (g), kilogram (kg), ton (t) and so on.

1 ton = 1, 000,000 grams (one million grams)

1 kg (1 kg) = 1 1,000 g (1 kg)

1 kg = 500g (1 g = 0.002kg)

1 mg = 0.00 1 g (1 g = 1000 mg)

1 μ g = 0.0000 1 μ g (1 μ g = 1000000 μ g)

1 nanogram = 0.0000000 1 gram (1 gram = 10000000 nanogram)