Weather balloon

As the demand for rubber increased so did the chemical industry s efforts to prepare a synthetic sub stitute One of the first elastomers (a synthetic poly mer that possesses elasticity) to find a commercial niche was neoprene discovered by chemists at Du Pont in 1931 Neoprene is produced by free radical polymerization of 2 chloro 1 3 butadiene and has the greatest variety of applications of any elastomer Some uses include electrical insulation conveyer belts hoses and weather balloons... [Pg.408]

Waxes hydrocarbon Wax printing Wax sizing materials Wax sweating Waxy corn WB4101 [613-67-2] W341C [110368-36-0] Weak interfaces Weapons Wear factors Wear resistance Weather balloons Weathering... [Pg.1067]

Dipped Goods. Gloves with and without cloth support are a typical example. Unsupported appUcations involve specialty medical gloves and weather balloons. Eor CR to compete with less expensive natural mbber, it must provide added value. Natural mbber medical examination gloves contain proteins that can cause an allergic reaction in both patients and medical personnel. Polychloroprene gloves avoid the problem for those individuals, but are too expensive for general use. Natural mbber weather balloons have less lift than CR balloons and are rapidly attacked by ozone in the upper atmosphere. [Pg.548]

Besides readings of Earth s surface temperatures taken with standard glass thermometers, direct readings of atmospheric temperatures have been taken with satellites and weather balloons. In addition to direct measurements of Earth s recent temperatures, proxy measurements of temperatures from farther in the past can be derived from borehole temperature measurements, from historical and physical evidence regarding the e xtent and mass of land and sea ice, and from the bleaching of coral reefs. [Pg.244]

Hydrogen for weather balloons is often supplied by the reaction between solid calcium hydride, CaH2, and water to form solid calcium hydroxide, Ca(OH)2, and hydrogen gas, H ... [Pg.62]

Self-Test 4.6A A helium weather balloon was filled at — 20.°C and a certain pressure to a volume of 2.5 X 104 L with 1.2 X 103 mol He. What is the molar volume ot helium under those conditions ... [Pg.269]

Self-Test 4.9B A weather balloon is filled with helium gas at 20.°C and 1.00 atm. The volume of the balloon is 250. L. When the balloon rises to a layer of air where the temperature is — 30.°C, it has expanded to 800. L. What is the pressure of the atmosphere at that point ... [Pg.273]

Chemistry is a foundation for many other disciplines, (a) Biochemists analyzing DNA profiles, (b) Meteorologist releasing weather balloon to study the chemistry of the upper atmosphere, (c) Technicians conducting DNA research, (d) Paleontologists preparing fossilized dinosaur bones for transport to laboratory for chemical analysis, (e) Astronomer studying the composition of asteroids. [Pg.2]

Self-Test 4.8B A weather balloon is filled with helium gas at 20°C and... [Pg.307]

PROBLEM 14.1 Hydrogen is used to inflate weather balloons because it is much less dense than air. Calculate the density of gaseous H2 at 25°C and 1 atm pressure. Compare your result with the density of dry air under the same conditions (1.185 X 10-3 g / cm3). [Pg.576]

PROBLEM 14.5 Calcium hydride is a convenient, portable source of hydrogen that is used, for example, to inflate weather balloons. If the reaction of CaH2 with water is used to inflate a balloon with 2.0 X 105 L of H2 gas at 25°C and 1.00 atm pressure, how many kilograms of CaH2 is needed ... [Pg.583]

Helium To provide an inert atmosphere for welding As a coolant in nuclear reactors With 20% oxygen, as a breathing gas for deep-sea divers To inflate the tyres of large aircraft To fill airships and weather balloons (Figure 11.12) In the helium-neon laser In low-temperature research, because of its low boiling point... [Pg.187]

Data from unmanned weather balloons and weather satellites,... [Pg.107]

A hydrogen-filled weather balloon occupies 48.0 ft3 at ground level where the pressure is 753 torr. Compute its volume at the top of the mountain where it is about to be launched when the temperature is the same as at ground level, but the pressure is only 652 torr. (We don t need to account for the elasticity of the skin.)... [Pg.73]

Figure 1. Supercritical flow reactor. Key (I) Mettler balance (2) flask with 1 0 (filtered and deaerated) (3) HPLC pump (4) bypass (three-way) valve (5) feed cylinder (6) weather balloon with feed solution (7) probe thermocouple (type K) (8) ceramic annulus (9) Hastelloy C-276 tube (10) entrance cooling jacket (11) entrance heater (12) furnace coils (13) quartz gold-plated IR mirror (14) window (no coils) (15) guard heater (16) outlet cooling jacket (17) ten-port dualloop sampling value (18) product accumulator (19) air compressor (20) back-pressure regulator and (21) outflow measuring assembly.

Figure 11.11 shows a meteorologist preparing to release a weather balloon partially filled with helium gas. As the balloon rises, atmospheric pressure decreases. The volume of the balloon increases. [Pg.428]

Weather balloons are partially inflated with helium. They carry specialised instruments to measure varying atmospheric conditions such as pressure, temperature, and humidity. [Pg.428]

In 1998, a weather balloon carrying instruments to measure the ozone layer drifted off course. It veered into transatlantic air routes, where it posed a serious danger. [Pg.434]

A weather balloon has a volume of 1000 L at a pressure of 740.0 torr. The balloon rises to a height of 1000 m where the atmospheric pressure is measured as 450.0 torr. Assuming there is no change in temperature, what is the final volume of the weather balloon ... [Pg.435]

A weather balloon containing helium is released into the atmosphere. As it rises, atmospheric pressure and temperature both decrease. Explain why the size of the balloon increases. [Pg.467]

Helium gas is stored in a steel cylinder with a volume of 100 L at 20°C. The pressure gauge on the cylinder indicates a pressure of 25 atm. The cylinder is used to blow up a weather balloon at 25°C. If the final pressure in the cylinder and the balloon is 1.05 atm, how large will the balloon be ... [Pg.469]

A weather balloon floats up into the atmosphere. The air pressure decreases as the balloon floats higher. Assuming the temperature remains constant, the balloon ... [Pg.526]

A polyethylene plastic weather balloon contains 65 L of helium, which is at 20.0°C and 94.0 kPa. How many moles of helium are in the balloon ... [Pg.465]

A weather balloon with a volume of 1.375 L is released from Earth s surface at sea level. What volume will the balloon occupy at an altitude of 20.0 km, where the air pressure is 10 kPa ... [Pg.884]

A weather balloon of known initial volume is released. The air pressures at its initial and final altitudes are known. Why can t you find its new volume by using these known values and Boyle s law ... [Pg.427]

A weather balloon is filled with helium that occupies a volume of 5.00 X 10" L at 0.995 atm and 32.0°C. After it is released, it rises to a location where the pressure is 0.720 attn and the temperature is -12.0°C. What is the volume of the balloon at that new location ... [Pg.449]

A weather balloon filled with helium (He) has a volume of 1.0 X 10" L at 1.00 atm and 30°C. It rises to an altitude at which the pressure is 0.60 atm and the temperature is —20°C. What is the volume of the balloon then Assume that the balloon stretches in such a way that the pressure inside stays close to the pressure outside. [Pg.375]

What mass of helium is needed to fill the weather balloon from Example 9.3 ... [Pg.376]

A helium-filled weather balloon has a volume of 7240 cubic feet. How many grams of helium would be required to inflate this balloon to a pressure of 745 torr at 21°C (1 = 28.3 L)... [Pg.452]

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