What is pressure at stp

Some textbooks define it differently than others, but the newest IUPAC standard temperature and pressure are:. This leads to a difference of about "0. Ever had your university lab notebook "torn apart" by a lab TA for "not enough information"?

Yeah, it's primarily because science tends to rely on consistency and reproducibility to prove that something is credible. If someone can't read your lab notebook and then reproduce your lab experiment without your input and correction, you haven't provided enough information to replicate that experiment precisely.

IUPAC has defined such standards so that people have consistent atmospheric conditions to use for comparisons of data from different experimental trials for the same type of experiment. That improves the accuracy to which an experiment can be reproduced. Chemistry Gases Gas Laws. Share Flipboard Email. Anne Marie Helmenstine, Ph. Chemistry Expert. Helmenstine holds a Ph. She has taught science courses at the high school, college, and graduate levels.

Facebook Facebook Twitter Twitter. Updated February 02, However, the "standard" is defined differently by various groups. STP values are most often cited for gases because their characteristics change dramatically with temperature and pressure.

Under these conditions, one mole of a gas occupies Because the standard varies by industry, it's good practice to state temperature and pressure conditions for measurements and not just say "STP. Featured Video. Cite this Article Format. Helmenstine, Anne Marie, Ph. Standard Conditions Versus Standard State. What Are Standard State Conditions? Topics Typically Covered in Grade 11 Chemistry. Standard Molar Entropy Definition in Chemistry.

Additional definitions from Google and OneLook. Entry last updated: Saturday, October 24, This page is copyright by ILPI. Unauthorized duplication or posting on other web sites is expressly prohibited. Send suggestions, comments, and new entry desires include the URL if applicable to us by email. Disclaimer : The information contained herein is believed to be true and accurate, however ILPI makes no guarantees concerning the veracity of any statement.

Use of any information on this page is at the reader's own risk. ILPI strongly encourages the reader to consult the appropriate local, state and federal agencies concerning the matters discussed herein.