For week #33 of STEM Saturday, we have another new contributor. Welcome @carlos84! In [Equivalent density and different forms of fluid circulation in an oil well](/@carlos84/equivalent-density-and-different-forms-of-fluid-circulation-in-an-oil-well), the author tells us about fluid dynamics in an oil well. It's easy to take for granted, but oil is still the "*life blood of civilization*", so this is a vitally important area of engineering. --- Welcome to our 33^rd **_STEM Saturday_** post promotion on the Steem blockchain. In celebration of the occasion, I have once again promoted a [Popular STEM](/trending/hive-109160) post to the top of the [/promoted](/promoted) list.

[![Oil Derrick from Pixabay](https://cdn.steemitimages.com/DQmZCP7fgSFU6aKqFmTMfLACUhXdy8Uxs6UiSqcKuFG99xf/image.png)](https://pixabay.com/photos/pumpjack-oil-derrick-downtown-2746285/)

^{Pixabay license from Christian Allen at source}

This marks the thirty-third consecutive Saturday that our community has held the top of the [/promoted](/promoted) page. As [previously announced](/@remlaps/popular-stem-or-announcement-our-barebones-experimental-visibility-service-is-now-live), the promoted post(s) will be pinned in our community, and will remain pinned until payout time or until dropping out of the top-2 [promoted posts for our community](/promoted/hive-109160). ### The Post This week, the promoted post is,[Equivalent density and different forms of fluid circulation in an oil well](/@carlos84/equivalent-density-and-different-forms-of-fluid-circulation-in-an-oil-well), by @carlos84 As with prior weeks, the post was passed through three separate online plagiarism checks before promotion. Here is the post at the top of [/promoted](/promoted): [![Steem blockchain promoted posts, January 7, 2023](https://cdn.steemitimages.com/DQmRp245puAYHNdoeC379kXx197pw78sUE5wq6DVZ8BJDxB/image.png)](https://cdn.steemitimages.com/DQmRp245puAYHNdoeC379kXx197pw78sUE5wq6DVZ8BJDxB/image.png) ### Promotion Cost In order to promote the post, I burned 0.015 SBD (equivalent to about ¹/₁₀ STEEM) by sending it to @null with the memo field set to: @[ACCOUNT]/[PERMLINK]. [![Steem blockchain burn transaction for January 7, 2023](https://cdn.steemitimages.com/DQmZY995rkveqxfdM6bqCY8QNgZQTcUAcB5cMX9DwQDQXp7/image.png)](https://cdn.steemitimages.com/DQmZY995rkveqxfdM6bqCY8QNgZQTcUAcB5cMX9DwQDQXp7/image.png) ### The Community The [Popular STEM](/trending/hive-109160) community is intended to be a place for accessible STEM conversations (Science, Technology, Engineering, and Mathematics). If you have an interest in STEM topics, please come join us! ### About **_STEM Saturday_**
If members would like to have your own STEM content considered for future promotions, please [come join us](/trending/hive-109160) and start contributing. I don't know how long I'll be continuing the tradition, but while I do, here are the minimum requirements for consideration (subject to change without notice ;-). 1. Original, plagiarism-free content 2. Minimum word count: currently 300 words, but this may be adjusted. 3. The content must not be cross-posted on other web sites or blockchains. Correct use of the #steemexclusive tag is encouraged. 4. English language. (sorry, it's the only one I know) 5. Because a post leaves [/promoted](/promoted) at payout time, posts created shortly before **_STEM Saturday_** may be more likely to be chosen than older posts. All community members are invited to create original and exclusive content that can be considered for future promotions. ---

Please help grow the science & technology audience on the Steem blockchain by following the Science and Technology on the Social Blockchain Facebook page then liking & sharing our links!

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[![image.png](https://cdn.steemitimages.com/DQmVc5QiSemwTgbZBBvWaDjzW3h3PbDhjLTcN3Vq2HeLA4K/image.png)](/promoted)

^{Pixabay license, source}

Reminder

Visit the [/promoted](/promoted) page and [#burnsteem25](/created/burnsteem25) to support the inflation-fighters who are helping to enable decentralized regulation of Steem token supply growth.