Specific Heat Capacity Definition

Specific Heat Capacity Definition Specific Heat Capacity Definition Specific heat capacity is the amount of heat energy required to raise the temperature of a substance per unit of mass. The specific heat capacity of a material is a physical property. It is also an example of an extensive property since its value is proportional to the size of the system being examined.In ​SI units, specific heat capacity (symbol: c) is the amount of heat in joules required to raise 1 gram of a substance 1 Kelvin.   It may also be expressed as J/kg ·K. Specific heat capacity may be reported in the units of calories per gram degree Celsius, too. Related values are molar heat capacity, expressed in J/mol ·K, and volumetric heat capacity, given in J/m3 ·K. Heat capacity is defined as the ratio of the amount of energy transferred to a material and the change in temperature that is produced: C Q / ΔT where C is heat capacity, Q is energy (usually expressed in joules), and ΔT is the change in temperature (usually in degrees Celsius or in Kelvin). Alternatively, the equation may be written: Q CmΔT Specific heat and heat capacity are related by mass: C m * S Where C is heat capacity, m is mass of a material, and S is specific heat. Note that since specific heat is per unit mass, its value does not change, no matter the size of the sample. So, the specific heat of a gallon of water is the same as the specific heat of a drop of water. Its important to note the relationship between added heat, specific heat, mass, and temperature change does not apply during a phase change. The reason for this is because heat that is added or removed in a phase change does not alter the temperature. Also Known As: specific heat, mass specific heat, thermal capacity Specific Heat Capacity Examples Water has a specific heat capacity of 4.18 J (or 1 calorie/gram  °C). This is a much higher value than that of most other substances, which makes water exceptionally good at regulating temperature. In contrast, copper has a specific heat capacity of 0.39 J. Table of Common Specific Heats and Heat Capacities This chart of specific heat and heat capacity values should help you get a better sense of the types of materials that readily conduct heat versus those which do not. As you might expect, metals have relatively low specific heats. Material Specific Heat(J/gC) Heat Capacity(J/C for 100 g) gold 0.129 12.9 mercury 0.140 14.0 copper 0.385 38.5 iron 0.450 45.0 salt (Nacl) 0.864 86.4 aluminum 0.902 90.2 air 1.01 101 ice 2.03 203 water 4.179 417.9 Sources Halliday, David; Resnick, Robert (2013).  Fundamentals of Physics. Wiley. p.  524.Kittel, Charles (2005). Introduction to Solid State Physics (8th Ed.). Hoboken, New Jersey, USA: John Wiley Sons. p. 141. ISBN 0-471-41526-X.Laider, Keith J. (1993). The World of Physical Chemistry. Oxford University Press. ISBN 0-19-855919-4.unus A. Cengel and Michael A. Boles (2010). Thermodynamics: An Engineering Approach (7th Edition). McGraw-Hill. ISBN 007-352932-X.

How to Write a Report

How to Write a Report How to Write a Report How to Write a Report By Mark Nichol It is likely that, at some point in your career, you will be asked or feel compelled to write a report. Here are seven steps to producing a successful account or analysis. 1. Identify the report’s objective: Inform, or advise? If the former, predict, or review? If the latter, persuade, or dissuade? 2. Consider your audience: Are your readers experts, or laypeople? Are they fellow employees, or colleagues in the same profession or industry? Take into account their educational level and their familiarity with the subject matter to guide your writing style and your use and explication of specialized vocabulary. 3. Research your topic. If you have been assigned the report, be sure the person you received the assignment from has thoroughly briefed you on its goal and its scope. If you are initiating the report yourself, again, be sure you know those parameters. Then, consult with other stakeholders those whose work relies on the dissemination of such reports and ask any experts you know for advice before studying print, online, and other media sources and collecting data. 4. Using all this information, produce a first draft. Review it to ascertain whether you have covered all the pertinent points and whether the report answers questions and/or resolves concerns inherent in the topic. Revise as necessary. 5. If it your responsibility to format the report and there is no template, research effective report design online and incorporate the principles to the best of your ability; however, don’t become distracted by this phase of the project or let design overwhelm the content. A crisp, clean presentation with an attractive layout is sufficient, but strategize how to use graphic information and how to emphasize key points with typographic treatment. 6. Ask colleagues or other knowledgeable associates to critique the latest draft and note any revisions they suggest inserting or deleting sections or details, reorganizing the structure, clarifying your argument or your point of view, and so on. 7. Produce a revised version, step away from it as your schedule allows, and then finesse it to create a final draft. If editing and/or proofreading are not established stages in the report’s development, at least ask someone whose skills you trust to check for errors, and incorporate the changes before submitting the report. Want to improve your English in five minutes a day? Get a subscription and start receiving our writing tips and exercises daily! Keep learning! Browse the Business Writing category, check our popular posts, or choose a related post below:7 Types of Narrative Conflict"Owing to" vs "Due to"Letter Writing 101