First atomic bomb used in battle

According to Official Guinness Records,

The first atom bomb to be used aggressively in battle, was dropped on Hiroshima, Japan by the United States at 8:16 a.m. on 6 August 1945. It had an explosive power equivalent to that of around 15 kilotons of trinitrotoluene (C7H5O6N3), called TNT. Code-named Little Boy, it was 3.04 m (10 ft) long and weighed 4,082 kg (9,000 lb). It burst 565 m (1,850 ft) above the city centre.

For a complete list of 1945 records, please visit 1945 Guinness Records in Japan.

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