Table of Contents
- 1 What is the density of helium at the same temperature and pressure?
- 2 Does the density of helium change with altitude?
- 3 What is the density of helium in G cm3?
- 4 What is helium density?
- 5 What is the density of helium at room temperature?
- 6 How do you find the density of a gas balloon?
- 7 What is the density of solid helium at room temperature?
- 8 How much pressure does it take to solidify helium?
- 9 What is the buoyant force on a balloon at 90 km?
What is the density of helium at the same temperature and pressure?
If we replace the air with Helium gas at the same temperature, the same particle density will yield the same pressure. But the mass density of Helium gas at room temperature and atmospheric pressure is only approximately 0.18 kg/m3.
Does the density of helium change with altitude?
2. This number represents the density of helium at the pressure and temperature conditions stated for 90 km altitude. It is assumed to be the helium gas density inside the balloon as well….Solution:
Temperature: | T = 187 K |
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Density: | A = 3.42 x 10-6 kg/m3 |
What is the number density number per volume of the helium particles contained in the balloon?
At 1 atm and 300 K, this gives n/V = 0.0406 mol/l. For air, which has a molar mass of 29.0 g/mol, this gives a density of 1.18 g/l. Helium, which has a mass of 4.00 g/mol, has a density of 0.164 g/l. Thus, a one-liter balloon of helium can lift a mass of (1.18-0.164) = 1.02 g.
What is the density of helium in G cm3?
Chemical properties of helium – Health effects of helium
Atomic number | 2 |
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Density | 0.178*10 -3 g.cm -3 at 20 °C |
Melting point | – 272.2 (26 atm) °C |
Boiling point | – 268.9 °C |
Vanderwaals radius | 0.118 nm |
What is helium density?
0.1785 gram/litre
helium
atomic number | 2 |
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atomic weight | 4.002602 |
melting point | none |
boiling point | −268.9 °C (−452 °F) |
density (1 atm, 0 °C) | 0.1785 gram/litre |
Does altitude affect helium balloons?
As a weather balloon rises into high altitudes, where air pressure decreases, the helium or hydrogen pressure inside the balloon increases and expands the balloon.
What is the density of helium at room temperature?
0.1786 g/L
Helium | |
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Phase at STP | gas |
Melting point | 0.95 K (−272.20 °C, −457.96 °F) (at 2.5 MPa) |
Boiling point | 4.222 K (−268.928 °C, −452.070 °F) |
Density (at STP) | 0.1786 g/L |
How do you find the density of a gas balloon?
Subtract the weight of the empty balloon, mB, from the weight of the full balloon, mGB. This will give you the mass of the gas alone, mG. Divide the mass of the gas, mG, by the volume, V, of the gas to find the density of the gas, DG.
What is the volume of a helium balloon?
So, for example, a 20-foot balloon has a radius of 10 feet. 10* 10 * 10 * 3.14 * 4/3 = 4,186 cubic feet of volume.
What is the density of solid helium at room temperature?
Solid helium has a density of 0.214 ± 0.006 g/cm3 at 1.15 K and 66 atm; the projected density at 0 K and 25 bar (2.5 MPa) is 0.187 ± 0.009 g/cm3. At higher temperatures, helium will solidify with sufficient pressure. At room temperature, this requires about 114,000 atm.
How much pressure does it take to solidify helium?
At higher temperatures, helium will solidify with sufficient pressure. At room temperature, this requires about 114,000 atm. Below its boiling point of 4.22 K (−268.93 °C; −452.07 °F) and above the lambda point of 2.1768 K (−270.9732 °C; −455.7518 °F), the isotope helium-4 exists in a normal colorless liquid state, called helium I.
What is the unit of specific weight of helium?
Helium – Density and Specific Weight Density, ρ, has units typically [kg/m3] or [lb/ft3], and is defined by the ratio of the mass to the volume of a substance: ρ = m/V where m = mass, units typically [kg] or [lb]
What is the buoyant force on a balloon at 90 km?
The buoyant force on the balloon is equal to the weight of the (fluid) atmosphere displaced. The ideal gas law holds in the form p = nkT where n is the number density in m -3, k is Boltzmann’s constant (k = 1.38 X 10 -23 j/K), T is the absolute temperature, and p is the pressure. Atmospheric conditions at an altitude of 90 km are: