{"id":2539,"date":"2011-11-18T18:00:42","date_gmt":"2011-11-19T02:00:42","guid":{"rendered":""},"modified":"2025-08-28T14:41:21","modified_gmt":"2025-08-28T21:41:21","slug":"2539","status":"publish","type":"post","link":"https:\/\/www.vernier.com\/til\/2539","title":{"rendered":"Why don&#8217;t the absorbance readings for the colorimeters and spectrometers have units?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Absorbance is a unitless measure of the amount of light of a particular wavelength that passes through a volume of liquid, relative to the maximum possible amount of light available at that wavelength.<\/p>\n<p class=\"wp-block-paragraph\">Absorbance readings are unitless because they are calculated from a ratio of the intensity of light transmitted through the sample (I) to the intensity of light transmitted through a blank (I<sub>o<\/sub>). <\/p>\n<p class=\"wp-block-paragraph\">Absorbance = log (I<sub>o<\/sub>\/I)<\/p>","protected":false},"excerpt":{"rendered":"<p>Absorbance is a unitless measure of the amount of light of a particular wavelength that passes through a volume of liquid, relative to the maximum&#8230;<\/p>\n","protected":false},"author":11015,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[1425,280,2163,954],"class_list":["post-2539","post","type-post","status-publish","format-standard","hentry","tag-absorbance","tag-col-bta","tag-spectrometer","tag-units"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/2539","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/users\/11015"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/comments?post=2539"}],"version-history":[{"count":0,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/2539\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/media?parent=2539"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/categories?post=2539"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/tags?post=2539"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}