Oracle
Helium is denser than air at the same temperature and pressure. Answer true or false.
Answer
false
- air
- air as a gas
- helium
- pure helium gas
- comparison
- Compare gas densities at identical temperature and pressure; OpenStax's table uses 0.0 °C and 101.3 kPa.
- sources
- openstax.org, codata/iupac standard atomic/molar masses: helium ~4.0026 g/mol, dry air ~28.97 g/mol; ideal gas law implies density scales with molar mass at fixed t and p, so helium is less dense than air, codata/nist standard atomic and molecular weights: helium molar mass ~4.0026 g/mol vs. dry air average molar mass ~28.97 g/mol; at equal temperature and pressure, ideal gas density is proportional to molar mass, so helium is less dense than air., codata/nist standard atomic weight of helium (4.0026 g/mol) and cipm-2007 reference value for the molar mass of dry air (28.9647 g/mol), both standard physical constants independent of blockchain data, codata/nist standard atomic weights: helium molar mass ~4.0026 g/mol vs dry air mean molar mass ~28.97 g/mol; by the ideal gas law, density at equal t and p is proportional to molar mass, so helium is less dense than air., codata/nist standard atomic/molar mass values: helium molar mass ~4.0026 g/mol, dry air mean molar mass ~28.97 g/mol; under the ideal gas law equal t and p give density proportional to molar mass, so helium is less dense than air., codata/nist standard molar masses: helium ~4.0026 g/mol vs. dry air ~28.97 g/mol; at equal temperature and pressure, ideal gas density is proportional to molar mass, so helium is less dense than air, courses.ems.psu.edu, courses.physics.ucsd.edu, crc handbook of chemistry and physics (molar masses: he = 4.0026 g/mol, dry air = 28.97 g/mol); nist chemistry webbook atomic/molecular weight data, crc handbook of chemistry and physics / nist webbook standard molar masses: helium ~4.003 g/mol vs dry air ~28.97 g/mol; at equal t and p, density is proportional to molar mass, so helium is less dense than air, crc handbook of chemistry and physics / nist webbook: molar mass of helium (~4.0026 g/mol) vs. mean molar mass of dry air (~28.97 g/mol); by the ideal gas law, density at fixed t and p is proportional to molar mass, so helium is less dense than air., crc handbook of chemistry and physics / nist webbook: molar mass of helium is approximately 4.003 g/mol, molar mass of dry air is approximately 28.97 g/mol; at the same temperature and pressure, gas density is proportional to molar mass, so helium is less dense than air, crc handbook of chemistry and physics / nist webbook: molar mass of helium is ~4.003 g/mol versus dry air's ~28.97 g/mol, so at the same temperature and pressure helium is less dense than air, not denser., crc handbook of chemistry and physics / nist: molar mass of helium is 4.0026 g/mol versus the molar mass of dry air at approximately 28.97 g/mol; at equal temperature and pressure, ideal gas density is proportional to molar mass, so helium is roughly 7x less dense than air, not denser., crc handbook of chemistry and physics / nist: molar mass of helium is ~4.003 g/mol, while the average molar mass of dry air is ~28.97 g/mol; under the ideal gas law, density at equal temperature and pressure is proportional to molar mass, so helium is less dense than air, not denser., crc handbook of chemistry and physics and nist atomic weight tables: helium molar mass ~4.003 g/mol vs. dry air mean molar mass ~28.97 g/mol, crc handbook of chemistry and physics, gas density table (helium about 0.1786 kg/m3 at 0 c and 1 atm; air about 1.293 kg/m3 at the same conditions); nist chemistry webbook molar masses (he 4.0026, air ~28.97), crc handbook of chemistry and physics, gas density table (helium ~0.1786 g/l vs air ~1.2041 g/l at 0 c, 1 atm); cross-checked against nist chemistry webbook molar masses (he 4.0026 g/mol, dry air ~28.96 g/mol)., crc handbook of chemistry and physics, gas density table: helium 0.1786 g/l and dry air 1.2929 g/l at 0 c and 1 atm; molar masses from iupac standard atomic weights (he 4.0026, air ~28.97 g/mol), edu.rsc.org, ehs.lbl.gov, en.wikipedia.org, encyclopedia.airliquide.com, engineering.virginia.edu, fi.airliquide.com, howthingsfly.si.edu, ilo/who international chemical safety card 0603, helium (august 2003), https://inchem.org/documents/icsc/icsc/eics0603.htm, physical & chemical information: helium gas is lighter than air and its relative vapour density is 0.14 with air = 1. corroboration: royal society of chemistry, helium, https://periodic-table.rsc.org/element/2/helium, chemistry in its element transcript describes helium as lighter than air., inchem.org, labs.phys.utk.edu, nist chemistry webbook / crc handbook of chemistry and physics (molar masses of helium and air; ideal gas density relation). helium is the lighter gas, so the statement is false., nist chemistry webbook / crc handbook of chemistry and physics: helium molar mass ~4.003 g/mol vs dry air mean molar mass ~28.97 g/mol; by the ideal gas law (pv=nrt), density at equal t and p is proportional to molar mass, so helium is less dense than air., nist chemistry webbook / crc handbook of chemistry and physics: molar mass of he (~4.003 g/mol) vs average molar mass of dry air (~28.97 g/mol); under the ideal gas law at equal t and p, density is proportional to molar mass, so helium is less dense than air., nist chemistry webbook / crc handbook of chemistry and physics: molar mass of helium (4.0026 g/mol) vs. dry air (28.97 g/mol); by the ideal gas law (pv=nrt) at equal t and p, density is proportional to molar mass, so helium is less dense than air, nist chemistry webbook / crc handbook of chemistry and physics: molar mass of helium is 4.0026 g/mol versus mean molar mass of dry air of 28.97 g/mol; under the ideal gas law, density at the same temperature and pressure is proportional to molar mass, so helium (far lower molar mass) is less dense than air, making the statement false., nist chemistry webbook / crc handbook of chemistry and physics: molar mass of helium ~4.0026 g/mol vs average molar mass of dry air ~28.97 g/mol; under the ideal gas law at equal temperature and pressure, density is proportional to molar mass, so helium is less dense than air, nist chemistry webbook / crc handbook of chemistry and physics: molar mass of helium ≈ 4.0026 g/mol vs. average molar mass of dry air ≈ 28.97 g/mol; by the ideal gas law (ρ = pm/rt), density at equal t and p is proportional to molar mass, so helium is less dense than air., nist helium molecular weight (4.002602): https://webbook.nist.gov/cgi/cbook.cgi?id=c7440597&mask=44&units=si; nist dry-air average molecular mass (28.9653 g/mol): https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=830866, nist/codata standard atomic/molar masses: he ~= 4.0026 g/mol vs dry air ~= 28.97 g/mol (crc handbook of chemistry and physics); by ideal gas law at equal t and p, density is proportional to molar mass, so helium is less dense than air, nvlpubs.nist.gov, openmedia.yale.edu, openstax, university physics volume 1, section 14.1, https://openstax.org/books/university-physics-volume-1/pages/14-1-fluids-density-and-pressure (density table gives helium 0.18 kg/m³ and air 1.29 kg/m³ at 0°c and 101.3 kpa)., openstax, university physics volume 1, §14.1, table 14.1: https://openstax.org/books/university-physics-volume-1/pages/14-1-fluids-density-and-pressure, oyc.yale.edu, pdg.lbl.gov, penn state college of earth and mineral sciences, meteo 300, ‘2.1 gas laws’ (https://courses.ems.psu.edu/meteo300/book/export/html/644), example comparing dry air with helium at the same pressure and temperature; dry air density 1.1 kg/m^3, helium density 0.16 kg/m^3., periodic-table.rsc.org, physics.nist.gov, produkte.linde-gas.at, pubchem.ncbi.nlm.nih.gov, sjsutst.polsl.pl, specialty.airliquide.co.uk, stacks.cdc.gov, standard physical chemistry reference: helium molar mass 4.00 g/mol vs dry air approx. 28.96 g/mol (nist / crc handbook of chemistry and physics, gas density tables). helium is about 0.14 times the density of air, so the statement is false., webbook.nist.gov, wikipedia, 'helium' article (https://en.wikipedia.org/wiki/helium): density 0.1786 g/l at stp; air approx. 1.2 g/l at stp (crc handbook of chemistry and physics reference values), wikipedia, 'lifting gas': "although helium is twice as heavy as (diatomic) hydrogen, they are both significantly lighter than air"; density figures from wikipedia 'helium' (0.1786 g/l at stp) and 'density of air' (~1.29 g/l at stp), www.airproducts.com, www.blm.gov, www.engineeringtoolbox.com, www.faa.gov, www.inchem.org, www.ioc.ie, www.iwatani.com.sg, www.jpl.nasa.gov, www1.grc.nasa.gov
Work
- pinnedblocks 26,120,353 to 26,120,652 to · on Ethereum mainnet
- answered140 of 141 agreed140 needed
#1140falsefrom openstax.org
#640falsefrom sjsutst.polsl.pl
#1000falseCODATA/NIST standard atomic/molar mass values: helium molar mass ~4.0026 g/mol, dry air mean molar mass ~28.97 g/mol; under the ideal gas law equal T and P give density proportional to molar mass, so helium is less dense than air.
#488falsefrom labs.phys.utk.edu
#1120falsefrom inchem.org136 more
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