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In physics and materials science, a drop tower or drop tube is a structure used to produce a controlled period of weightlessness for an object under study. Air bags, polystyrene pellets, and magnetic or mechanical brakes are sometimes used to arrest the fall of the experimental payload. In other cases, high-speed impact with a substrate at the ...
Sodium azide is an ionic solid.Two crystalline forms are known, rhombohedral and hexagonal. [1] [6] Both adopt layered structures.The azide anion is very similar in each form, being centrosymmetric with N–N distances of 1.18 Å.
Sodium bicarbonate rockets are often used in science classes to demonstrate principles of chemistry and physics. In the experiment, a film canister is filled with water, an effervescent tablet (commonly Alka-Seltzer) is added and the canister tightly sealed.
The main problem with the concept of vacuum airships is that, with a near-vacuum inside the airbag, the exterior atmospheric pressure is not balanced by any internal pressure. This enormous imbalance of forces would cause the airbag to collapse unless it were extremely strong (in an ordinary airship, the force is balanced by the pressure of the ...
The third module was the lunar lander, a 58 cm (23 in) diameter sphere protected by two hemispherical airbags. The 105 kg (231 lb) sphere had a hermetically sealed compartment that held communications apparatus, batteries, thermal control systems, a timer, and the science experiments.
Two styles have evolved in the use of gloveboxes for synthetic chemistry. In a more conservative mode, they are used solely to store, weigh, and transfer air-sensitive reagents. Reactions are thereafter carried out using Schlenk techniques. The gloveboxes are thus only used for the most air-sensitive stages in an experiment.
The Air-defense experiments were a series of management science experiments performed between 1952 and 1954 by RAND Corporation's Systems Research Laboratory. The experiments were designed to provide information about organizational learning and how teams improved their performance through practice.
First, Adam and Jamie created a small-scale experiment using three tanks filled with water and mineral oil to outline the differences in the wave patterns; the first tank was designed straight, the second with two sharp right angles, and the third with two rounded right angles. When waves were created at one end of each tank, the respective ...