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Results tagged with material-science
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user 63055
The study of how the properties of matter arise from its structure at all scales and of how processing can be used to modify those properties (often in pursuit of a specific application).
0
votes
How to calculate the time to uniformly heat an object by natural convection?
Assuming a relatively small piece of steel, the temperature at the surface of the metal will be the temperature of the bulk in less than a minute. No need to calculate conduction of heat inside your p …
- 3,062
1
vote
Definition of granular material
The first line of An Introduction to Granular Flow by K. Kesava Rao and Prabhu R. Nott (2008):
A granular material is a collection of solid particles or grains, such that most of the particles are …
- 3,062
15
votes
Accepted
Why solids expand on heating
A simple and naïve model* for thermal expansion has two neighboring atoms represented by a pair of balls connected by a spring.
Image source: General Physics (calculus based) Class Notes, Dr. R …
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0
votes
Foil/material that is invisible to electrons but not to infra-red
Is there a material that is absolutely invisible to electrons?
No. All materials interact with electrons, just to different extents. This is the principle behind the backscatter detectors found i …
- 3,062
6
votes
Accepted
Relationship between electrical resistivity and density
There is no relationship between the density of a metal and its electrical resistivity.
There is a big database of material properties called MatWeb which is recommend as a legitimate source of data …
- 3,062
3
votes
Accepted
Are hardness, strength and toughness of materials not the same thing in a way?
Strength and Toughness
Image source: Materials Group - University of Cambridge
We need the separate words "strength" and "toughness" because sometimes materials with high toughness and high st …
- 3,062
3
votes
2
answers
2k
views
Is thermal conductivity correlated with speed of sound in metals?
Right off the bat I should say: thermal conductivity and electrical conductivity are definitely correlated in metals.
image source: https://www.doitpoms.ac.uk/tlplib/thermal_electrical/printall.ph …
- 3,062
11
votes
What common materials absorb most infrared light?
The IR sensors that OP is talking about work by emitting IR from an LED and then measuring IR intensity reflected back from an object close enough (scroll to Sharp GP2Y0A21YK IR Proximity Sensor). Add …
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0
votes
How do I determine an unknown element if I know the diffraction lines?
Identification of materials by XRD is through matching the unique "fingerprint" of each material's diffraction pattern. From AZoMaterials:
Each chemical compound or phase reflects x-rays slightly …
- 3,062
1
vote
Accepted
Are there other properties besides lower boiling point that make isobutane a better refriger...
They have different pressure curves:
But to answer the question: yes, there are other properties that make isobutane preferred over n-butane. The most widely
used refrigerants in household applianc …
- 3,062