Everything about Model Physical totally explained
A physical
model is a smaller or larger physical copy of an object. The object being modelled may be small (for example, an atom) or large (for example, the
Solar System).
The geometry of the model and the object it represents are often
similar in the sense that one is a rescaling of the other; in such cases the
scale is an important characteristic. However, in many cases the similarity is only approximate or even intentionally distorted. Sometimes the
distortion is systematic with for example a fixed scale horizontally and a larger fixed scale vertically when modelling
topography of a large area (as opposed to a model of a smaller mountain region, which may well use the same scale horizontally and vertically, and show the true
slopes).
Physical models allow visualization, from examining the model, of information about the thing the model represents. A model can be a physical object such as an architectural model of a building. Uses of an architectural model include visualization of internal relationships within the structure or external relationships of the structure to the environment. Other uses of models in this sense are as
toys.
Instrumented physical models are the most effective way of investigating fluid flows such as around
hydraulic structures. These models are scaled in terms of both geometry and important forces, for example using
Froude number or
Reynolds number scaling (see
Similitude).
A physical model of something large is usually smaller, and of something very small is larger. A physical model of something that can move, like a
vehicle or
machine, may be completely static, or have parts that can be moved manually, or be powered. A physical model may show inner parts that are normally not visible. The purpose of a physical model on a smaller scale may be to have a better overview, for testing purposes, as
hobby or
toy. The purpose of a physical model on a larger scale may be to see the structure of things that are normally too small to see properly or to see at all, for example a model of an
insect or of a
molecule.
A physical model of an
animal shows the animals physical composition without it walking or flying away, and without danger, and if the real animal isn't available. A soft model of an animal is popular among children and some adults as
cuddly toy.
A model of a
person may for example be a
doll, a
statue, and in fiction a
robotic
humanoid, for example the mechas in the movie
A.I..
A model is a
3D alternative for a 2D representation such as a
drawing or
photograph, or in the case of a
globe, a 3D, undistorted alternative for a flat world
map.
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