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A table fan. A fan is a powered machine used to create a flow of air. A fan consists of a rotating arrangement of vanes or blades, generally made of wood, plastic, or metal, which act on the air. The rotating assembly of blades and hub is known as an impeller, rotor, or runner. Usually, it is contained within some form of housing, or case. [1]
Handheld Brise fan from 1800. A handheld fan, or simply hand fan, is a broad, flat surface that is waved back-and-forth to create an airflow. Generally, purpose-made handheld fans are folding fans, which are shaped like a sector of a circle and made of a thin material (such as paper or feathers) mounted on slats which revolve around a pivot so that it can be closed when not in use.
Rechargeable battery. A rechargeable battery, storage battery, or secondary cell (formally a type of energy accumulator), is a type of electrical battery which can be charged, discharged into a load, and recharged many times, as opposed to a disposable or primary battery, which is supplied fully charged and discarded after use.
Renewable energy in Pakistan is a relatively underdeveloped sector; however, in recent years, there has been more and more interest to explore renewable energy resources for the energy production. Around 10.57% of Pakistan’s total installed power generation capacity (in 2020) comes renewables (wind, solar and biogas ). [ 1 ]
Nuclear energy. Sultan Bashiruddin Mahmood a Pakistani nuclear engineer developed a device to detect heavy water leaks in nuclear steam cylinders while working at Knapp nuclear power reactor near Karachi in 1972. [ 12 ] The device is patent in his name under his initials SBM probe and is widely used in nuclear power plants to date.
The best preserved fort is the Derawar fort (pictured) which was built in the 9th century by Rai Jajja Bhati of the Rajput Bhati clan. In the 18th century, it was taken over by Bahawalpur and remained the residence of the Nawab until the 1970s, constant occupation contributing to its preservation. The massive fort has 40 circular bastions that ...
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