Soda straws

Pinch The industrial equivalent of controlling flow bv pinching a soda straw is the pinch valve, Mves of this tvpe use fabric-reinforced elastomer sleeves that completely isolate the process fluid from the metal parts in the valve. The valve is actuated bv applying air pressure directly to the outside of the sleeve, causing it to contract or pinch. Another method is to pinch the sleeve with a linear actuator with a specially attached foot. Pinch valves are used extensively for corrosive material service and erosive sliirrv senice. This type of valve is used in applications with pressure drops up to 10 bar (145 psi),... 

The amount of calcium carbonate precipitating from any particular drop is imperceptibly small. Nevertheless, over the years, these deposits grow into translucent hollow tubes of CaC03 called soda straws (see photo inset). Soda straws lengthen as water drops fall from their tips. These delicate structures can reach lengths of several feet. In time, water flowing over the outside of the tube adds width to the growing formation, and the soda straw matures into the familiar stalactite. 

Materials plastic or paper soda straws (12), 22- or 26-gauge wire, scissors... 

Cut four soda straws into thirds. Wire the pieces to make a cube. All angles are 90°. 

I disciplined myself, in those days, getting up at 4 30 A.M. to study books on cybernetics, and insisting on boring my fellow residents with a ccmputer model I had made from bendable soda straws, tinker toy parts, paper clips and marbles. Success and failure were equally stimulating and nothing seemed to faze me for long. I was young, carefree and passionate. 

Gravity-operated binary adder circuif made of soda straws, straight pins, tinker toy parts and marbles (1959)... 

When you suck into a drink through a soda straw, what causes the drink to rise into your mouth the muscles of your lungs and cheeks or the weight of the atmosphere ... 

Pull/chemical. This mode departs from the others in that it uses no electricity. To construct this fuze, a small glass vial of sulphuric acid, a 3-inch length of plastic soda straw, potassium chlorate, and sugar are needed. 

Purchase a box of wide-dlametcr common plastic soda straws. These straws should slip down inside the 1/4-inch... 

Slip one piece of insulation onto each side of the bridge wire assembly. These pieces act as added insulation so that the hot wire does not short out either through the plastic soda straw into the piece of aluminum tube or to each other above the notch. After the priming material is packed into the tube, the bridge wire assembly is inserted firmly down into the primer in the bottom of the tube, the wires turned down, and the tube sealed (more on this in Chapter 3). 

For instantaneous detonation of booby-trap grenades,tape a plastic soda straw on the fuse tube and fill it loosely with match-head material,dosing the end with a plug of Kleenex or cotton. To prevent confusion, shorten the safety levers of the modified grenades. 

Despite its high altitude well above modem timber line, Spannagel Cave is locally decorated by speleothems, including soda straws, stalactites, helictites, stalagmites, flowstones, moonmilk and spar (in order of decreasing abundance). The vast majority of... 

In order to establish the depositional history of the speleothems, outcrop-scale features such as discontinuities were mapped. Four discontinuity surfaces were found within the NG flowstone (Figure 4). The discontinuities are laterally continuous over the entire outcrop of the specimen sampled. Debris such as broken soda straws and stalactites lie horizontally on these surfaces (Figure 4). Although columnar calcite crystals with rhombohedral terminations protrude from these sub-horizontal surfaces, they are... 

Soda straw stalactites from Ernesto cave and Crag... 

Put the ends of two soda straws into your mouth. Place the other end of one of the straws into the water in the jar and allow the end of the other straw to remain in the air. Try to draw water up the straw by sucking on both straws simultaneously. Record your observations. 

Problem 3-8. The Dynamics of Capillary Rise in a Tube. In Chap. 2, Problem 2-30, we considered the problem of capillary rise of a liquid up into a soda straw. We assume that the soda straw has an inside diameter R and is placed in a pan of liquid of density p. The surface tension between the water and the air is y, and the water makes a contact angle 6 at the water-straw interface. We showed that the liquid will rise up into the straw to an equilibrium height... 

PS or HIPS for nacreous soda-straw tubes Ogawa et al., 1973... 

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