- 52 Views
- Uploaded on
- Presentation posted in: General

Energy in Thermal Processes

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Energy in Thermal Processes

Heat

Calorimetry

Phase Changes

- _______ _______, U, is energy of atoms and molecules of a system
- Includes KE of translation, rotation, vibration
- Includes PE of chemical/electrical bonds

- ______, Q, is transfer of energy between system and environment due to temperature difference ΔT

- Historically defined in terms of __________ _________ of object
- calorie (cal) – the energy necessary to raise the temperature of 1g of water from 14.5°C to 15.5°C
- British thermal unit (BTU) – the energy necessary to raise the temperature of 1 lb of water from 63°F to 64°F

- Heat (like work) is a transfer of energy and has SI units of ________

- Every substance requires a ________ amount of energy per unit mass to change T by 1°C
- Characterize the material by its _______ heat c
- Units are J/(kg∙°C)
- See Table 11.1, p. 355

- Use containers that are good ________ (no energy leaves/enters the container)
- Put warmer and cooler materials in container
- Apply conservation of ______

In general

Sign of ____ takes care of sign of Q

- Sometimes energy transfer results in changes of ____ (melting/freezing = _____, boiling/condensing = _________)
- _____________ does not change
- Characterized by latent heat L
- See Table 11.2, p. 360; units are J/kg

Use + if ______ energy, – sign if _______ energy

Fig. 11.3, p. 361