lightweight insulation
91Concrete — This article is about the construction material. For other uses, see Concrete (disambiguation). Outer view of the Roman Pantheon, still the largest unreinforced solid concrete dome.[1] …
92Door — For other uses, see Door (disambiguation). A door is a movable structure used to open and close off an entrance, typically consisting of a panel that swings on hinges or that slides or rotates inside of a space. When open, they admit ventilation… …
93Wankel engine — The Wankel engine is a type of internal combustion engine which uses a rotary design to convert pressure into a rotating motion instead of using reciprocating pistons. Its four stroke cycle is generally generated in a space between the inside of… …
94Perlite — is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian. It occurs naturally and has the unusual property of greatly expanding when heated sufficiently.Properties and usesWhen it… …
95Pebble bed reactor — Sketch of a pebble bed reactor in Italian …
96Woofer — This article is about a loudspeaker driver. For individuals trained in remote first aid, see Wilderness First Responder. Woofer is the term commonly used for a loudspeaker driver designed to produce low frequency sounds, typically from around 40… …
97Camping — is an outdoor recreational activity.The participants, known as campers, get away from urban areas, their home region or civilization and enjoy nature while spending one or more nights, usually at a campsite. Camping may involve the use of a tent …
98Mars Exploration Rover — Artist s conception of rover on Mars Part of a panorama taken by the Spi …
99Foam — This article is about the substance formed from trapped gas bubbles. For other uses, see Foam (disambiguation). Soap foam bubbles Contents 1 Definition …
100Sodium silicate — E550 redirects here. For the Italian locomotive, see FS Class E550 Sodium silicate …
