what is ton?

what is ton?
Ton is 1000kg and 25 mun is ton in Pakistan

 The ton is a unit of measure. It has a long history and has acquired a number of meanings and uses over the years. It is used principally as a unit of mass, and as a unit of volume. It can also be used as a measure of energy, for truck classification, or as a colloquial term.

A ton of refrigeration (commonly abbreviated as TR) is a unit of power used in some countries (especially in North America) to describe the heat-extraction capacity of refrigeration and air conditioning equipment. It is defined as the heat of fusion absorbed by melting 1 short ton (2,000 lb; 0.893 long tons; 0.907 t) of pure ice at 0 °C (32 °F) in 24 hours.[1][2] It is equivalent to the consumption of one ton of ice per day and originated during the transition from stored natural ice to mechanical refrigeration.

A refrigeration ton is approximately equivalent to 12,000 BTU/h or 3.517 kW. Air-conditioning and refrigeration equipment capacity in the U.S. is often specified in "tons" (of refrigeration). Many manufacturers also specify capacity in BTU/h, especially when specifying the performance of smaller equipment.    (TJK)

1ton = 12000 British thermal unit (BTU)

1.5 ton = 18000 British thermal unit (BTU)

2 ton = 24000 British thermal unit (BTU)     (TJK)