International Physics Olympiad is an annual physics competition for high school students. It is one of the International Science Olympiads. The first IPhO was held in Warsaw, Poland in 1967. The IPhO 2018 would be held in Lisbon, Portugal.
Each national delegation is made up of at most five student participant and two leaders who are selected on a national level. Mentors and teachers are a part of this delegation. The students participate individually through a set of high intensity difficult theoretical and practical questions.
IPhO is a competition between individuals and each participant has to solve both theoretical and experimental problems. The competition lasts for two days. One day is devoted to theoretical problems. Three problems with a duration of five hours involving at least four areas of physics taught in secondary schools, the total number of the marks is 30. The other day is devoted to experimental problems which consist of one or two problems with a duration of five hours, the total number of the marks is 20. These two days are separated by at least one full day of rest. The problems are prepared and chosen by the host country, and they have to be accepted by the International Board which consists of the delegation leaders from each participating country.