Answer:
thoroughly scrutinizing, especially in a disconcerting way.
Explanation:
Answer:
A solid has definite volume and shape, a liquid has a definite volume but no definite shape, and a gas has neither a definite volume nor shape.
Explanation:
Answer:
The true statements are statements 1 and 4.
Explanation:
1. Heavier atoms possess greater entropy at a given temperature than lighter atoms- True.
Concerning atomic substances, heavier atoms possess greater entropy at a given temperature than lighter atoms, which is a result of the relation between a particle's mass and the spacing of quantized translational energy levels.
2. The weight of an atom has no effect on entropy - False.
The entropy of a substance increases with its molecular weight, complexity, and with temperature.
3. Molecules with greater numbers of atoms are associated with lower entropy - False.
Any chemical reaction that increases the number of molecules also increases entropy as a chemical reaction that increases the number of molecules would be a reaction that pours energy into a system.
4. The entropy of a substance is influenced by the structure of the particles that comprise the substance - True.
The structure of the particles (atoms or molecules) in a substance influences its entropy.
For molecules, greater numbers of atoms (regardless of their masses) increase how the molecules can vibrate and thus the number of possible microstates and the system entropy.
Answer and Explanation:
The main objective that the torsion test serves is the determination of the material behavior or the behavior of the test sample when subjected to torsional stresses or forces due to the application of moments that results in shear stress along the axis.
Plasticity is the property of elastic material and tension or shear stresses leads to plasticity in a material where these links are the weakest, that gives torsion test a major advantage over the tension test.
Torsion tests are performed on materials to deduct properties like the shear modulus of elasticity, the torsional strength, and the MOR, i.e., Modulus of Rupture.
This test can be used to obtain larger strain values of strain without any complexity as that in tension test.
This test provides a curve of shear-stress-shear strain which is more significant in determining the plasticity as compared to the curve of stress-strain in tension test.
Maximum torque for a given value of maximum stress will be 2 times higher in torsion as that of tension.
In torsion, for plastic flow, the threshold value of shear stress is achieved before the threshold value of normal stress for fracture whereas in tension the critical value of normal stress is achieved sooner than the critical shear for plastic flow.