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350<h1>The free physics textbook</h1>
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481 |<p>
481Maybe, nowadays, you are forced to remain at home.  In that case,
482 |this site offers two choices:<p>
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484
485<header><h3>Enjoy an Entertaining and Free Pdf Book on Physics,
486the Science of Motion:</h3>
487
488<!-- New in Feb 2015: no captcha --> <p class="tmenu"> <a class="tmenuesto"
489href="https://www.motionmountain.net/MM.zip"
490onclick="_gaq.push(['_trackEvent', 'ZIP downloads', 'Download',
491'index/MM.zip']);"><img alt="zip file of physics book" class="c7" src="IMAGES/zip-icon.png"
492width="32" height="32" > <img alt="pdf" class="c7"
493src="IMAGES/pdficon_large.png" width="32" height="32"><strong>
494Download</strong> <span style="color:black">the 5 free pdf volumes of 
495the Motion Mountain Physics Textbook.  The 2021 edition, a beautiful 
496ebook in a single zip file with ca.  520&nbsp;MB, is in full colour and 
497contains many films, stories and facts: every one of the over 2000 
498pages is wonderful and captivating.</span></a></p>
499
500<p>
501<img class="floatcover" alt="Motion Mountain free Physics Textbook cover"
502title="Motion Mountain free Physics Book"
503src="IMAGES/midicover.jpg" width="114" height="161" >
504<img class="floatcover" alt="Motion Mountain free Physics Book page 148"
505title="Snow Speed Records from the Motion Mountain free Physics Textbook"
506src="IMAGES/Vol1-snow.jpg" width="114" height="161" >
507<img class="floatcover" alt="Motion Mountain free Physics Textbook page
508136"
509title="Colour Types - from the Motion Mountain free Physics Book"
510src="IMAGES/Vol4-colours.jpg" width="114" height="161" > 
511<img class="floatcover2" alt="Motion Mountain free Physics Book page 91"
512title="Navigation and Insects - from the Motion Mountain free Physics
513Textbook"
514src="IMAGES/Vol1-fly.jpg" width="114" height="161" >
515</p>
516
517<!--
518 | <p>This is an open textbook and a free textbook at the same time: A
519free 
520 | pdf textbook for download.</p>
521-->
522
523<p><strong>Explore</strong> the motion of plants, animals, lightning,
524satellites, charges, light and empty space itself! Be fascinated by
525molecular
526motors, black holes, the beauty of nature and the simplicity of how it
527works:
528Explore the principle of cosmic laziness – least action –, the maximum
529speed,
530the largest distance, the highest power, and gauge symmetry, the symmetry
531that
532explains electric motors, radioactivity and quarks!</p>
533
534
535<p><strong>A summary</strong> of the five volumes, and thus 
536<a href="9lines.html" lang="en">of all physics, takes just 9 lines. 
537Click here.</a>
538
539
540<p><B>Pledge:</B> <a href="author.html#pledge">No knowingly false or
541misleading statement is found in the text and website.</a> Truthfulness -
542combined with politeness - make the world a better place.  If you find a
543mistake, please send an email.  
544Feel free to block all cookies, to use private browsing or ad
545blockers, without any disadvantage.  This website does not generate
546significant income.  Since years, the received donations are lower than 
547the costs of the internet provider. Any support is welcome.
548
549
550<p><STRONG>Translations by <a 
551href="sponsors.html">volunteers</a></STRONG> are available in 
552<a 
553href="vietnamese.html">Vietnamese</a>,
554<a 
555href="naski.html">Serbian (Latin script)</a>, 
556<a 
557href="arabic.html">Arabic</a>,
558<a 
559href="bienvenue.html">French</a>,
560<a 
561href="benvenuti.html">Italian</a>,
562<a 
563href="japanese.html">Japanese</a>,
564<a 
565href="persian.html">Farsi</a>, 
566<a 
567href="bienvenida.html">Spanish</a> and
568<a 
569href="simplifiedchinese.html">Chinese</a>.
570The original English edition has been improved for over 20 years.</p>
571
572
573<p> 
574<img class="floatcover" alt="Motion Mountain free Physics Textbook page
57523: 
576Electricity"
577title="Electric Animals and Devices - from the Motion Mountain free
578Physics Book"
579src="IMAGES/V3-P23.jpg" width="114" height="161" >
580<img class="floatcover" alt="Motion Mountain free Physics Book page 74: 
581Crystals"
582title="Crystals - from the Motion Mountain free Textbook Book"
583src="IMAGES/Vol5-p74-new.jpg" width="114" height="161" > 
584<img class="floatcover" alt="Motion Mountain free Physics Textbook page
585153: 
586Lunar Eclipse" 
587title="Lunar Eclipse - from the Motion Mountain free Physics Book"
588src="IMAGES/P153-new.jpg" width="114" height="161" > 
589<img class="floatcover2" alt="Motion Mountain free Physics Book page 279: 
590Water Waves" 
591title="Water Waves - from the Motion Mountain free Physics Textbook"
592src="IMAGES/P279-new.jpg" width="114" height="161" > 
593</p>
594</header>
595
596<!--
597 | <p>The text is a free physics manual and workbook,
598 | expanding notes that provide a free introduction to physics.
599 | But above all, the text is a guide to enjoying physics and nature.</p>
600-->
601
602<p><strong>The free pdf volumes of the 2021 physics textbook
603edition</strong> 
604&ndash; <a href="print.html"> the paper volumes are a pretty present by the
605way</a> &ndash; tell about the race to make images floating in mid-air with
606lasers, tell about the sound of falling batteries, tell about how to
607measure images on the eye's retina in living humans, tell about the sounds
608deep inside the Earth, show the possibilities of very long baseline
609interferometry for testing general relativity, include the new definition
610of the kilogram and the other SI units, list the effects of weightlessness
611on cosmonauts, show how to multiply with fingers, explain how physics helps
612with basketball, and present many other stunning images, facts and stories
613about the motion of things, shadows, light, stars, planets, black holes and
614quantum particles.</p>
615
616
617<p>
618<img class="floatcover" alt="Motion Mountain free Physics Textbook page
619152" 
620loading="lazy" src="IMAGES/Vol1-p152-new.jpg" width="114" height="161" > 
621<img class="floatcover" alt="Motion Mountain free Physics Textbook page 57"
622loading="lazy" src="IMAGES/V3-P57.jpg" width="114" height="161" >
623<img class="floatcover" alt="Motion Mountain free Physics Book page 67"
624loading="lazy" src="IMAGES/V3-P67.jpg" width="114" height="161" >
625<img class="floatcover2" alt="Motion Mountain free Physics Book page 127"
626loading="lazy" src="IMAGES/V3-P127.jpg" width="114" height="161" >
627</p>
628
629<p><strong>Find out</strong> what fireworks, mobile phones and butterflies
630have in common, how muscles work, how colours appear, how levitation is
631possible, why we can see the stars, and which problems in physics are still
632unsolved.  Enjoy many wonderful puzzles about nature.  Read about the great
633advances in our understanding of the processes that surround us.  Learn how
634the story of the universe shapes our night sky, the Sun, our landscape, our
635bodies and all the atoms that make it up.  Find interesting experiments to
636repeat.  Explore the power of the concepts that are used in physics.</p> 
637
638<p><B>If you are</B> between the age of 16 and 106, you will <i>enjoy</i>
639reading
640these free physics books.  <a href="videos.html">These videos show why.</a>
641Whether you learn or study physics at school, university or college,
642whether you are just curious about physics and want to learn about it by
643yourself, or whether you want new ideas for teaching physics, you will
644enjoy this free textbook.  If you want more motivation and an overview of
645the wonderful stories and adventures that await you, <a
646href="project.html#his">read this section.</a></p>
647
648<!--
649 | <p><strong>The volumes of the 2019 edition</strong> tell about the new
650SI
651 | unit definitions, show how to rotate a ball glued into a soft mattress
652for
653 | ever and ever - and challenge you to be the first to film this feat;
654they
655 | also show how to create floating images with a simple toy, explain that
656 | usual light bulbs produce speeds faster than light when switched on,
657tell
658 | about why it is correct to say that the sun has already set when we see
659it
660 | just touching the horizon in the evening, challenge you to build a
661 | high-precision ball-chain (`Newton's cradle'), show that a formula for
662pi
663 | is hidden in the hydrogen spectrum, provide more fun with quantum
664physics
665 | and colours, tell about noise-producing plants, ask about the Spanish
666 | burton and the fool's tackle, present the measurement unit for the
667 | spiciness of chili peppers, and present many other stunning images,
668facts
669 | and stories about motion of things, shadows, light, stars, planets,
670black
671 | holes and quantum particles.</p>
672-->
673
674<!--
675 | <p><strong>For a present</strong> to others or to yourself,<a 
676 |
677href="https://www.amazon.de/s/ref=nb_sb_noss?__mk_de_DE=%C3%85M%C3%85%C5%BD%C3%95%C3%91&amp;url=search-alias%3Daps&amp;field-keywords=Motion+Mountain+physics+schiller"
678 | onclick="_gaq.push(['_trackEvent', 'Store', 'Click', 'print/store']);">
679 | <strong>get a paper edition</strong> at Amazon (in black & white or in
680 | colour).</a> 
681 | </p>
682-->
683<!--
684 | or <a
685 |
686href="https://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Ddigital-text&field-keywords=Motion+Mountain+Schiller&rh=n%3A133140011%2Ck%3AMotion+Mountain+Schiller"
687 | onclick="_gaq.push(['_trackEvent', 'Store', 'Click',
688'index/kindle']);">a
689 | Kindle version.</a>
690-->
691
692<p><strong>Entertaining and surprising on every page,</strong> the five
693free physics pdf files tell about</p>
694<p>
695<a
696href="https://www.motionmountain.net/classical.html">Vol. I: Sport,
697raindrops and
698animal life: mechanics, gravity and heat.</a>
699<br>
700<a
701href="https://www.motionmountain.net/relativity.html">Vol. II: Moving
702empty space
703and the sky at night: relativity and the structure of the universe.</a>
704<br>
705<a href="https://www.motionmountain.net/electromag.html">Vol. III:
706Lightning,
707lasers and nerves: electricity, optics, the brain, language and truth.</a>
708<br>
709<a href="quantum.html">Vol. IV: Colours and the quantum of change: quantum
710physics
711and light quanta.</a>  <br>
712<a
713href="https://www.motionmountain.net/quantum.html">Vol. V: Pleasure and
714the stars:
715biophysics, nuclear physics and radioactivity.</a>
716
717
718<!-- #INCLUDE PATH="y-freevolumedownload.html" -->
719
720<p class="tmenu">
721<a class="tmenuesto"
722href="https://www.motionmountain.net/motionmountain-volume1.pdf"
723onclick="_gaq.push(['_trackEvent', 'PDF downloads', 'Download', 
724'downloadpage/Class-vol1']);"><img class="c7" alt="Physics pdf" src="IMAGES/pdficon_large.png" 
725width="32" height="32"	>Free download of
726volume I - FALL, FLOW AND HEAT &nbsp; &nbsp; &nbsp; &nbsp; (260 MB).</a> 
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731href="https://www.motionmountain.net/motionmountain-volume2.pdf"
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733'downloadpage/Relat-vol2']);"><img class="c7" alt="Physics pdf" src="IMAGES/pdficon_large.png" 
734width="32" height="32"	>Free download of 
735volume II - RELATIVITY AND COSMOLOGY &nbsp; &nbsp; &nbsp; &nbsp; (50 MB).</a> 
736</p>
737
738<p class="tmenu">
739<a class="tmenuesto"
740href="https://www.motionmountain.net/motionmountain-volume3.pdf"
741onclick="_gaq.push(['_trackEvent', 'PDF downloads', 'Download',
742'downloadpage/Elmag-vol3']);"><img class="c7" alt="Physics pdf" src="IMAGES/pdficon_large.png" 
743width="32" height="32"	>Free download of
744volume III - LIGHT, CHARGES AND BRAINS &nbsp; &nbsp; &nbsp; &nbsp; (80 MB).</a> 
745</p>
746
747<p class="tmenu">
748<a class="tmenuesto"
749href="https://www.motionmountain.net/motionmountain-volume4.pdf"
750onclick="_gaq.push(['_trackEvent', 'PDF downloads', 'Download', 
751'downloadpage/Quan-vol4']);"><img class="c7" alt="Physics pdf" src="IMAGES/pdficon_large.png" 
752width="32" height="32"	 >Free download of volume IV - THE QUANTUM
753OF CHANGE &nbsp; &nbsp; &nbsp; &nbsp; (38 MB).</a>
754</p>
755
756<p class="tmenu">
757<a class="tmenuesto"
758href="https://www.motionmountain.net/motionmountain-volume5.pdf"
759onclick="_gaq.push(['_trackEvent', 'PDF downloads', 'Download', 
760'downloadpage/Quan-vol5']);"><img class="c7" alt="Physics pdf" src="IMAGES/pdficon_large.png"
761width="32" height="32"	>Free download of
762volume V - MOTION INSIDE MATTER: PLEASURE, TECHNOLOGY AND STARS &nbsp; &nbsp; &nbsp; 
763&nbsp; (85 MB).</a> 
764</p>
765
766
767<!-- /#INCLUDE -->
768
769<p>The Motion Mountain Physics Textbook is written for pupils, students,
770teachers and anybody curious about nature: the text is full of telling
771anecdotes, captivating riddles, unusual tables, astonishing photographs and
772beautiful films.  It has been downloaded over 500 000 times.  It is a fun
773pdf book that expands your curiosity and your studies. </p> 
774<!-- 100 000 was in early
7752011, 160 000 in fall 2012, 200 000 in January 2014, stopped counting
776directly; since that time, about 40 000 per year --> 
777
778<!--
779 | <p class="tmenu"><a class="tmenuesto" href="online.html">Read the
780volumes online
781 | here.</a></p>
782-->
783
784<!--
785 | <p>An Introduction to Modern Physics: relativity and quantum physics,
786 | cosmology and particles, optics and modern mechanics, technology and 
787 | biophysics</p>
788-->
789
790
791<!--
792 | <p><a href="https://www.motionmountain.net/penitentiaryhalt.php"><span
793 | class="c5">oh</span></a></p>
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795
796<p><strong>Fun leads to fascination.</strong> Numerous fun 
797facts are found in the book, conveying the charm of physics.
798The book makes the reader discover that precise observation,
799description and thinking are worth it.  Nature is beautiful and full of
800riddles and wonders.  Precision is important in learning, research,
801teaching and business.  Distinguishing truth, mistakes and lies, the
802possible and the impossible, the thinkable and the
803unthinkable, is useful in all aspects of life.</p>
804
805<p><a class="testo" href="prizes.html"><strong>Prizes and rewards</strong>
806are offered</a> for solving a number of challenges and for helping to
807improve the text.</p>
808
809
810<!--
811 | <h3>Donations to the Free Physics Textbook</h3>
812 | 
813 | <p>are welcome! No profit has ever been made: of the sum spent on the
814project
815 | so far - many tens of thousand Euros - less than a quarter has been
816covered by
817 | donations.</p>
818 | 
819 | <h3>Motion Mountain Physics Free PDF for Download</h3>
820 | 
821 | <p>If you are in Germany, please support the project, at no cost to
822you, by buying your usual 
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835
836<!--
837 | <h3>Paper versions</h3>
838 | 
839 | <p>The <b>colour paper</b> edition is called "Motion Mountain - The
840 | Colours of Physics". Its
841 | <a
842href="https://www.amazon.com/s?k=1508507457+%7C+1508578567+%7C+1508646937+%7C+1508524726+%7C+1542304954+%7C+1508525307+%7C+1508524483&i=stripbooks-intl-ship&ref=nb_sb_noss"
843 | onclick="_gaq.push(['_trackEvent', 'Store', 'Click',
844'print/store']);">7 
845 | colour paper volumes are found here</a>. In the colour edition, 
846 | for technical reasons, the first volume is split into two.
847 | 
848 | 
849 | <p>The cheaper <b>black & white paper</b> edition is called "Motion
850 | Mountain - The Adventure of Physics" and its
851 | <a
852href="https://www.amazon.com/s?k=%22Adventure+of+Physics%22+%26+%22Schiller%22&i=stripbooks-intl-ship&s=date-desc-rank&qid=1569265002&ref=sr_st_date-desc-rank"
853 | onclick="_gaq.push(['_trackEvent', 'Store', 'Click',
854'print/store']);">6 
855 | black & white paper volumes are found here</a>. 
856 | 
857 | 
858 | <p>The content of both paper 
859 | editions is the same. Only the title is different. 
860-->
861
862<!--
863 |<h3><a href="research.html">&#9658; Ponder a Whisper on the Unification
864of Physics</a></h3>
865 |<p>The strand conjecture is a <B><a href="bet.html">bet</a></B> on the
866 |common description of general relativity and the standard model of
867particle
868 |physics.  <a href="research.html">It is presented on the research
869page.</a>
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