Module 5- Real-World Physics Discussion
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Nov 24, 2024
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Temperature and Heat
The topic that I chose to discuss for this week’s real-world
discussion is thermal expansion. This topic is relative in our everyday lives
both professionally and personally. They three key applications for this
topic are the materials of an aircraft expanding due to the friction created
by the air, coolant overflow tanks in cars, and even frozen pipes that
burst.
Thermal expansion is the process of substances such as solids, liquids,
and gasses to expand or contract when heated or cooled. Depending on
temperature, the expansion or contraction of an object is much larger yet
still unnoticeable to the human eye. To further understand this concept,
the explanation for these objects to expand or contract is “because the
atoms and molecules vibrate through a larger distance and push each
other apart” (Ostkiek & Bord, 2018, p. 172). Within this topic there is two
sub-topics. These topics include linear thermal expansion and volume
thermal expansion. The equation to find the linear expansion of an object
is: where is the original length (m), is the change in temperature (C), and
is the coefficient of solids (x 10^-6/C). For volume thermal expansion, the
following equation is used to determine the expansion: where is the
change in volume, is the initial volume (m^3), is the coefficient of volume
expansion (10^-6/K) and is the change in temperature (C).
There are several impacts that thermal expansion has on our everyday life
and aviation. To begin, the materials used in creating aircraft is not
susceptible to thermal heat from the friction caused by the air. Typically,
an aircraft will expand between 15-25 centimeters during a flight due to
the air friction (The Physics Hypertextbook, n.d.). We also experience
thermal expansion in the coolant overflow tanks within our cars. When the
engine becomes too hot the coolant expansion tank absorbs the heat and
minimizes the pressure in the engine. Finally, we also experience busted
pipes in the winter.
Thermal expansion is a very important and relevant topic to discuss and
understand. To begin, engineers must take this concept into consideration
when building a bridge or even a building. If the calculation is done
incorrectly and the materials used to create the structure expand or
2
contract could cause a unstable infrastructure and could
collapse.
References
Ostdiek, Bern J & Bord, Donald J. (2018).
Inquiry into Physics.
Cengage
Learning. Retrieved on May 26, 2022, from Inquiry into Physics
(virdocs.com)
The Physics Hypertextbook. (n.d.)
Thermal Expansion.
Retried on June 22,
2022, from Thermal Expansion – The Physics Hypertextbook
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Related Questions
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A: 68 Farehneits, B: 17.9 Fareinheit
K: -0.002564
TOD: 98.6 Fareinheit
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V:01
Expert Q&A
Done
Question 1: In your own words, write down the differences
between thermodynamic and heat transfer. (3 Marks)
Question 2: Estimate the heat loss per square metre of surface
through a brick wall 0.5 m thick when the inner surface is at 400
K and the outside surface is at 300 K. The thermal conductivity
of the brick may be taken as 0.7 W/mK. (2 Marks)
Question 3: A furnace is constructed with 0.20 m of firebrick,
0.10 m of insulating brick, and 0.20 m of building brick. The
inside temperature is 1200 K and the outside temperature is 330
K. If the thermal conductivities are as shown in the figure below,
estimate the heat loss per unit area. (5 Marks)
1200 K
330 K
Insulating
brick
X-0.10m
k= 0.21
Ordinary
brick
X=0.20 m
Fire brick
X= 0.20 m
k= 1.4
k= 0.7
(W/mK)
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SEE MORE QUESTIONS
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Recommended textbooks for you
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning

Principles of Heat Transfer (Activate Learning wi...
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ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Cengage Learning