Calorimeter Definition in Chemistry

Calorimeter Definition in Chemistry A calorimeter is a device used to measure the heat flow of a chemical reaction or physical change. The process of measuring this heat is called calorimetry. A basic calorimeter consists of a metal container of water above a combustion chamber, in which a thermometer is used to measure the change in water temperature. However, there are many types of more complex calorimeters. The basic principle is that heat released by the combustion chamber increases the temperature of the water in a measurable way. The temperature change may then be used to calculate the enthalpy change per mole of substance A when substances A and B are reacted. The equation used is: q Cv(Tf - Ti ) where: q is the amount of heat in joulesCv  is the calorimeters heat capacity in joules per Kelvin (J/K)Tf and Ti are the final and initial temperatures Calorimeter History The first ice calorimeters were built based on Joseph Blacks concept of latent heat, introduced in 1761. Antoine Lavoisier coined the term calorimeter in 1780 to describe the apparatus he used to measure heat from guinea pig respiration used to melt snow. In 1782, Lavoisier and Pierre-Simon Laplace experimented with ice calorimeters, in which heat needed to melt ice could be used to measure heat from chemical reactions. Types of Calorimeters Calorimeters have expanded beyond the original ice calorimeters. Adiabatic calorimeter: Some heat is always lost to the container in an adiabatic calorimeter, but a correction factor is applied to the calculation to compensate for heat loss. This type of calorimeter is used to study runaway reactions.Reaction calorimeter: In this type of calorimeter, the chemical reaction occurs within an insulated closed container. Heatflow versus time is measured to arrive at the reaction heat. This is used for reactions intended to run at a constant temperature or to find the maximum heat released by a reaction.Bomb calorimeter: A bomb calorimeter is a constant-volume calorimeter, constructed to withstand the pressure produced by the reaction as it heats the air within the container. The temperature change of water is used to calculate the heat of combustion.Calvet-type calorimeter: This type of calorimeter relies on a three-dimensional fluxmeter sensor made of rings of thermocouples in series. This type of calorimeter allows for a larger sample size and reacti on vessel size, without sacrificing the accuracy of the measurement. An example of a Calvet-type calorimeter is the C80 calorimeter. Constant-pressure calorimeter: This instrument measure the enthalpy change of a reaction in solution under conditions of constant atmospheric pressure. A common example of this type of device is the coffee-cup calorimeter.

Profile of Toyo Ito, 2013 Pritzker Laureate

Profile of Toyo Ito, 2013 Pritzker Laureate Toyo Ito was the sixth Japanese architect to become a Pritzker Laureate. Throughout his long career, Ito has designed residential homes, libraries, theaters, pavilions, stadia, and commercial buildings. Since Japans ruinous tsunamis, Toyo Ito has become an architect-humanitarian known for his Home-for-All initiative. Background: Born: June 1, 1941 in Seoul, Korea to Japanese parents; family moved back to Japan in 1943 Education and Career Highlights: 1965: University of Tokyo, Department of Architecture1965-1969: Kiyonori Kikutake Architects and Associates (Kikutake is associated with the Metabolism Movement)1971: Founded Urban Robot (URBOT), renamed Toyo Ito Associates, Architects in 1979, Tokyo, Japan Selected Works by Ito: 1971: Aluminum House, Tokyo, Japan1976: White U House, Nakano-ku, Tokyo, Japan1984: Silver Hut House, Nakano-ku, Tokyo, Japan (1986 Architecture Institute of Japan award)1986: Tower of Winds, Yokohama-shi, Kanagawa, Japan1991: Yatsushiro Municipal Museum, Yatsushiro-shi, Kumamoto, Japan1997: Dome in Odate, Odate-shi, Akita, Japan (Ministry of Education Award; Encouragement of Arts Aware; Japan Art Academy Prize)2000: Sendai Mediatheque, Sendai-shi, Miyagi, Japan (2001 Grand Prize of Good Design Award from Japan Industrial Design Promotion Organization; 2003 Architectural Institute of Japan Prize; 2006 Public Building Award)2002: Serpentine Gallery Pavilion, London, UK2004: Matsumoto Performing Arts Centre, Matsumoto-shi, Nagano, Japan2004: TODS Omotesando, Shibuya-ku, Tokyo, Japan2005: Mikimoto Ginza, Tokyo, Japan2006: Meiso no Mori Municipal Funeral Hall, Kakamigahara-shi, Gifu, Japan2007: Tama Art University Library, Hachioji-shi, Tokyo, Japan2008: Za-Koenji Public Theatre, Suginam i-ku, Tokyo, Japan 2009: Main Stadium for the World Games 2009, Kaohsiung, Republic of China (Taiwan)2010: Hotel Porta Fira, Barcelona, Spain2011: Toyo Ito Museum of Architecture, Imabari-shi, Ehime, Japan2012: Yaoko Kawagoe Museum, Saitama, Japan The Taichung Metropolitan Opera House, Taichung City, Republic of China (Taiwan) was begun in 2005 and is under construction. Selected Awards: 2000: Arnold W. Brunner Memorial Prize, American Academy of Arts and Letters2006: Royal Gold Medal, Royal Institute of British Architects (RIBA)2013: Pritzker Architecture Prize Ito, in His Own Words: Architecture is bound by various social constraints. I have been designing architecture bearing in mind that it would be possible to realize more comfortable spaces if we are freed from all the restrictions even for a little bit. However, when one building is completed, I become painfully aware of my own inadequacy, and it turns into energy to challenge the next project. Probably this process must keep repeating itself in the future. Therefore, I will never fix my architectural style and never be satisfied with my works.- Pritzker Prize Comment About the Home-for-All Project: After the earthquake and tsunami of March 2011, Ito organized a group of architects to develop humane, communal, public spaces for survivors of natural disasters. The Sendai Mediatheque had been partially damaged during the 3.11 earthquake, Ito told Maria Cristina Didero of domus magazine. To the citizens of Sendai, this piece of architecture had been a beloved cultural salon....Even without a specific program, people would nonetheless gather around this place to exchange information and interact with one another....This led me to realize the importance of a small space like the Sendai Mediatheque for people to gather and communicate within disaster areas. This is the starting point of Home-for-All. Every community has its own needs. For Rikuzentakata, an area devastated by the 2011 tsunami, a design based on natural wooden poles with attached modules, similar to ancient pole or pile dwellings, was exhibited at the Japan Pavilion of the 2012 Venice Architecture Biennale. A full-scale prototype was built onsite in early 2013. Itos public service work with the Home-for-All initiative was cited by the 2013 Pritzker Jury as a direct expression of his sense of social responsibility. Learn More About Home-for-All:Toyo Ito: Re-building from disaster, an interview with Maria Cristina Didero in domus online magazine, January 26, 2012Toyo Ito: Home-for-All, an interview with Gonzalo Herrero Delicado, Marà ­a Josà © Marcos in domus online magazine, September 3, 2012Home-for-All, 13th Venice Biennale of Architecture Learn More: Toyo Ito: Forces of Nature by Jessie Turnbull, Princeton Architectural Press, 2012Toyo Ito: Sendai Mediatheque by Gary Hume, Actar, 2002Toyo Ito Works Projects Writings by Andrea Maffei, 2002Toyo Ito: Blurring Architecture 1971-2005 by Ulrich Schneider, 1999Toyo Ito by Toyo Ito, Riken Yamamoto, Dana Buntrock, Taro Igarashi, Phaidon, 2014 Sources: Toyo Ito Associates, Architects, website at www.toyo-ito.co.jp; Biography, the Pritzker Architecture Prize website; Pritzker Prize Media Kit, p. 2 (at www.pritzkerprize.com/sites/default/files/file_fields/field_files_inline/2013-Pritzker-Prize-Media-Kit-Toyo-Ito.pdf)  ©2013 The Hyatt Foundation [websites accessed March 17, 2013]