[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-572030-105":3,"detail-sidebar-cat-1-en-105":81,"doc-detail-572030-en":127},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":74,"head_meta":76,"extra_data":78,"updated_unix":80},105,"en","atmospheric-chemistry-cheat-sheet-version-129-last-update-22-may-2015","Atmospheric Chemistry Cheat Sheet - Version 1.29 - Last Update 22-May-2015","","Atmospheric Chemistry Cheat Sheet compiles practical reference conversions and constants for atmospheric chemistry calculations. It covers mixing-ratio and molec-to-mass concentration conversions, aerosol particle mass/number/volume estimates, pressure and flowrate conversions, temperature and pressure profile benchmarks, water vapor vapor-pressure values, kinetic theory parameters, and gas-phase diffusion approximations. It also provides oxidant/UV exposure concepts, species lifetime “age” equations, and photolysis calculation starters with typical j-values and spectral/absorption data sources.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/template/","Template",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/template/general/","General",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/template/atmospheric-chemistry-cheat-sheet-version-129-last-update-22-may-2015/572030/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/atmospheric-chemistry-cheat-sheet-version-129-last-update-22-may-2015/572030.png","ImageObject",442,249,{"name":42,"@type":43},"Quinn Holloway","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-10-22","2026-10-13",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",7,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"What conversions are provided for relating mixing ratios to molecule or mass concentrations?","Question",{"text":63,"@type":64},"The sheet includes conversions between mixing ratios and molec/cm³ at standard conditions, and equations to convert mixing ratios to mass concentrations using molecular weights.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"How does the cheat sheet estimate oxidant “ages” like OH, NO3, and O3?",{"text":68,"@type":64},"It gives age formulas based on exponential expressions using species concentrations and characteristic constants, with example reference values and a table of equivalent ages.",{"name":70,"@type":61,"acceptedAnswer":71},"What photolysis information is included for calculating j-values?",{"text":72,"@type":64},"It lists typical midday surface values for key photolysis rates (e.g., jNO2 and j1D), points to absorption cross-sections and quantum yields databases, and references models and standard spectra used to obtain spectral light fluxes and j-values.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},572030,1792122253,{"code":4,"msg":82,"data":83},"success",[84,89,94,99,104,109,114,119,124],{"id":85,"doc_module":22,"doc_module_name":25,"category_name":86,"show_sort_weight":87,"slug":88},11,"Presentations",90,"presentations",{"id":90,"doc_module":22,"doc_module_name":25,"category_name":91,"show_sort_weight":92,"slug":93},12,"Resumes",80,"resumes",{"id":95,"doc_module":22,"doc_module_name":25,"category_name":96,"show_sort_weight":97,"slug":98},14,"Invoices",70,"invoices",{"id":100,"doc_module":22,"doc_module_name":25,"category_name":101,"show_sort_weight":102,"slug":103},15,"Posters",60,"posters",{"id":105,"doc_module":22,"doc_module_name":25,"category_name":106,"show_sort_weight":107,"slug":108},16,"Social 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Templates",5,"papers-templates",{"id":125,"doc_module":22,"doc_module_name":25,"category_name":29,"show_sort_weight":4,"slug":126},158,"general-158",{"code":4,"msg":82,"data":128},{"doc_id":79,"user_id":129,"nickname":42,"user_avatar":130,"doc_module":22,"category_id":125,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":131,"file_id":132,"file_url":133,"file_type":134,"file_size":135,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":136,"language":137,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":138,"faqs":139,"seo_title":140,"seo_description":12,"update_tm":141,"read_time":142},2336474466712,"https://ap-avatar.wpscdn.com/davatar_a8503ba1806abce46bf441b54a3ca4cd","# Atmospheric Chemistry Cheat Sheet\n\n   \nVersion:1.29-Last Update:22-May-2015  \nCompiled byJL.Jimenez.CU-Boulder-shortcut to this page:http:/tinyurl.com/ac-cheat  \n   \n   \nIf you find an error or know of other resources that could go here,email Jose at jose.imenez@colorado.edu (And thanks for iput from manypeople already!)  \n   \n## 1.Key Conversions and Parameters\n\n   \nConversions between mixing ratios and molec cm3  \n   \n● Values at 1 atm and 298 K(Ref:Finlayson-Pitts &Pitts,p.34).  \n   \n01 atm ～2.46×10¹⁹molec cm-301%   ～2.46×1017molec cm-³  \n～2.46×10¹³molec cm-3o 1 ppm  \n～2.46×1010molec cm-3o 1 ppb  \n～2.46×10⁷moleccm-3o 1 ppto 1 ppq ~246×10⁴molec cm⁻³  \n● Values under other P&T conditions  \no Multiply above by P/(1 atm)*(298 K)/(T)  \no At 1 atm&273.15K replace 2.46 by 2.69(known as Loschmidt Number)o For Boulder (P～837 mbar)at room T (293 K)replace 2.46 by 2.07  \n   \nConversions between mixing ratios and mass concentrations(Finlayson-Pitts &Pitts.p.34)  \n   \n●A(μg m-3)=A(ppb)×0.0409×MW  \n(at 298 K and 1 atm)o N₂(μg m-3)=N₂(ppb)×1.15  \n(MW=28)oNO₃(μg m⁻3)=NO₃(ppb)×2.54  \n(MW=62)o SO4(μg m⁻3)=SO4(ppb)×3.93  \n(MW=98)oB(pg m³)=B(ppb)×10.23(B is an organic with MW=250)  \n●A(ng m-3)=A(ppt)×0.0409×MW  \nMass and Number of Molecules in one aerosol particle  \n●Assumes spherical shape with material density of1.4gcm³and no internal voids,and MW=150g mor¹  \n\n| Diameter  \u003Cbr>(nm)   | Mass  \u003Cbr>(fg)   | Molecules   | Volume  \u003Cbr>(μm³)   | Mass  \u003Cbr>Concentration for  \u003Cbr>1000 particle cm  \u003Cbr>3  \u003Cbr>(μg m-³)   | Volume Concentration  \u003Cbr>for 1000 particle cm  \u003Cbr>3(μm³cm⁻3)   | Surface Area  \u003Cbr>Concentration for  \u003Cbr>1000 particle cm  \u003Cbr>3(m²m³)&   |\n| --- | --- | --- | --- | --- | --- | --- |\n| 100   | 0.73   | 2.94×10⁶   | 0.0005   | 0.73   | 0.52   | 3.1×105   |\n| 250   | 11.5   | 4.6×10⁷   | 0.0082   | 11.5   | 8.2   | 1.96x10-4   |\n| 1   | 733   | 2.94×10⁹   | 0.52   | 733   | 524   | 3.1×10⁻³   |\n\n&Multiply by 10⁶to convert to μm²cm³  \nOther Conversions  \n   \n● Pressure Conversions  \n   \no 1 atm =14.7 psi  \no psia=absolute pressure,psig =difference from 1 atm  \no 1 inch Hg =25.40 Torr =33.86 mbar  \n● Standard Flowrate =Volumetric Flowratex(273.15/T)x(P/1 atm)  \n●SOA△CO ratios:80 μgm⁻³ppb⁻¹=0.0687 g/g(at 293K and 1 atm)  \nTvpical values of important parameters:  \n   \n● Vertical profile of temperature and pressure:International Standard Atmosphere  \n   \no 11 km:-57 C,226 mbar  \no 20 km:-57 C,54 mbar  \n● Aerosol surface area in the atmosphere:  \no Mexico City～2×10-3m²m-³=2×10³mm²m-³(Fig 1D in Volkamer et al.2007  \n   \no Clean areas～1×10⁴m²m-³  \n● H₂O vapor pressure(in mbar =hPa)(Ref):  \no Over ice at 240 K:0.273(Review of ice Pvap--includes equations)  \n   \no over ice or water at oC:6.1  \no at 20℃:23.4(=2.3%of 1 atm,if RH=100%,or~1%of 1 atm if RH~45%)  \no at 30℃:42.5  \n● Kinetic theory  \no Mean free path of air:65 nm at 1 atm(x 1atm/P for other pressures)  \no RMS thermal speed of N2 at 300 K:458 m/s(Ref)  \no Time between collisions:0.14 ns(calculated from above)  \no Collision Frequency:7.1×10⁹Hz  \n●Gas-Phase Diffusion Coefficients  \no D=3.5×10-6m²s-1.(approx.straight-chain C16 hydrocarbon (Hilal eto al..2003)  \n   \n   \n●Planetary Scale (Ref:D.Fahey,S.Madronich,or calculated)  \no Radius of the Earth(mean):6371 km  \no Total mass of the atmosphere:5.2×10²1g  \no Number of molecules in the atmosphere:~1044  \no Surface area ofallaerosols in the atmosphere～1×10¹4m²  \no Surface area of all Earth /Oceans～1.25×10¹4m²10.87×10¹⁴m²  \n● \"Standard\"Conditions of P&T(there are many definitions!)o 1 μg sm-³=1μg m⁻³under 1 atm and 273.15 K(used in NASA aircraft studies)  \n   \n● Air Quality Standards for Health Purposes:EPA/WHO/EU  \n   \n   \n   \n● Important constants(Ref:NIST)  \n   \no Na=6.022142E23 mol-¹=Avogadro constant  \no kb=1.38065E-23 JK-1=Boltzmann constant  \no R=8.31447 Jmol-1k-1  \n=molar gas constant  \no h=6.626068E-34Js  \n=Planck constant  \noc=2.99792458E8ms-1  \n=speed of light in vacuum  \nm³kg-¹s-2  \no G=6.673E-11  \n=Netwonian constant of grav","cbCaibSo3AqXI3qO","https://ap.wps.com/l/cbCaibSo3AqXI3qO","pdf",4009089,22,"English","# Key Conversions and Parameters\n## Species Lifetimes & Exposures\n## Photolysis Calculations","[{\"question\":\"What conversions are provided for relating mixing ratios to molecule or mass concentrations?\",\"answer\":\"The sheet includes conversions between mixing ratios and molec/cm³ at standard conditions, and equations to convert mixing ratios to mass concentrations using molecular weights.\"},{\"question\":\"How does the cheat sheet estimate oxidant “ages” like OH, NO3, and O3?\",\"answer\":\"It gives age formulas based on exponential expressions using species concentrations and characteristic constants, with example reference values and a table of equivalent ages.\"},{\"question\":\"What photolysis information is included for calculating j-values?\",\"answer\":\"It lists typical midday surface values for key photolysis rates (e.g., jNO2 and j1D), points to absorption cross-sections and quantum yields databases, and references models and standard spectra used to obtain spectral light fluxes and j-values.\"}]","Atmospheric Chemistry Cheat Sheet - Version 1.29 - Last Update 22-May-2015 | PDF",1791925119,8]