In thermodynamics and engineering, a heat engine is a system that converts heat to mechanical energy, which can then be used to do mechanical work. It does this by bringing a working substance from a higher state temperature to a lower state temperature. A heat source generates thermal energy that brings the working substance to the higher temperature state. The working substance generates work in the working body of the engine while transferring heat to the colder sink until it reaches a lower temperature state. During this process some of the thermal energy is converted into work by exploiting the properties of the working substance. The working substance can be any system with a non-zero heat capacity, but it usually is a gas or liquid. During this process, some heat is normally lost to the surroundings and is not converted to work. Also, some energy is unusable because of friction and drag.
The Women's 100 metres at the 2011 World Championships in Athletics was held at the Daegu Stadium on August 27, 28 and 29.
The Men's 100 metres at the 2011 Summer Universiade took place on 16–17 August. The gold medal was won by Jacques Harvey of Jamaica in a time of 10.14 seconds and was followed home by Rytis Sakalauskas of Lithuania in silver and Su Bingtian of China in bronze
The Men's 110 metres hurdles at the 2011 World Championships in Athletics was held at the Daegu Stadium on August 28 and 29.
The women's 100 metres hurdles event at the 2011 Summer Universiade was held on 18–19 August.
The men's 100 metres at the 2013 World Championships in Athletics was held at the Luzhniki Stadium on 10 and 11 August.
The men's 110 metres hurdles at the 2013 World Championships in Athletics was held at the Luzhniki Stadium on 11 and 12 August.
The women's 100 metres hurdles at the 2013 World Championships in Athletics was held at the Luzhniki Stadium on 12–15 August.
The women's 100 metres at the 2013 World Championships in Athletics was held at the Luzhniki Stadium on 11–12 August and was won by Shelly-Ann Fraser-Pryce.
The women's 100 metres at the 2014 European Athletics Championships took place at the Letzigrund on 12 and 13 August. Dutch runner Dafne Schippers won gold in 11.12 seconds.
The men's 100 metres at the 2015 World Championships in Athletics was held at the Beijing National Stadium on 22 and 23 August.
The men's 200 metres at the 2015 World Championships in Athletics was held at the Beijing National Stadium on 25, 26 and 27 August.
The men's 110 metres hurdles at the 2015 World Championships in Athletics was held at the Beijing National Stadium on 26, 27 and 28 August.
The men's 100 metres event at the 2017 Summer Universiade was held on 23 and 24 August at the Taipei Municipal Stadium.
The men's 200 metres event at the 1978 Commonwealth Games was held on 8 and 10 August at the Commonwealth Stadium in Edmonton, Alberta, Canada.
The women's 100 metres at the 2018 European Athletics Championships took place at the Olympiastadion on 6 and 7 August.
The women's 200 metres at the 2018 European Athletics Championships takes place at the Olympiastadion on 10 and 11 August.
The women's 100 metres at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium on 18 and 19 August.
The women's 200 metres at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium on 20 and 21 August.
The men's 200 metres at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium on 20 and 21 August.
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