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This is a diagram for one derivation of Bernoulli's Equation. I created this image using MetaPost; in order to produce the raster form, I compiled the source with MetaPost, embedded the resulting file in a pdfLaTeX document, viewed the PDF file with GSview (I tried Acrobat Reader, but its antialiasing was rather poor), and took a screen capture.

The MetaPost source code for this image is provided below (it is licensed under the same licenses as the image) in order to allow easy modification of the image. It's not particularly well-written code (one of my goals in creating it was to learn MetaPost), but anyone who might find it useful can try to make some use of it.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%  bernoulli.mp                                                              %
%  A MetaPost diagram                                                        %
%  Created on 12 July 2005                                                   %
%  Copyright (c) 2005 by MannyMax                                            %
%  Some rights reserved; see accompanying information for details            %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

beginfig(1);

u := 1cm;
path t,b,m,pa[],pb[];
pair a[],b[];
picture alab[],blab[];
numeric lwidth,lheight,rwidth,rheight,tubelen,cpgap;
color backcol,chunkcol,capcol;

lwidth = 1u;
rwidth = 2u;
lheight= 2u;
rheight= 3u;
tubelen= 10u;
cpgap  = 1u;

%set diagram colors
backcol = 0.27734375*green + 0.73828125*blue;
chunkcol= 0.62500000*green + 0.88281250*blue;
capcol  = 0.70703125*green + 0.90234375*blue;

z0=(                0, lheight+(lwidth/2));
z4=((tubelen/2)-cpgap, lheight+(lwidth/2));
z5=((tubelen/2)+cpgap, rheight+(rwidth/2));
z1=(          tubelen, rheight+(rwidth/2));

z2=(                0, lheight-(lwidth/2));
z6=((tubelen/2)-cpgap, lheight-(lwidth/2));
z7=((tubelen/2)+cpgap, rheight-(rwidth/2));
z3=(          tubelen, rheight-(rwidth/2));

t=z0---z4..z5---z1;
b=z2---z6..z7---z3;
m=1/2[z0,z2]..1/2[z4,z6]..1/2[z5,z7]..1/2[z1,z3];

fill buildcycle(z0--z2,t,z1--z3,b) withcolor backcol;

fill unitsquare xscaled tubelen yscaled 0.25u shifted (0,-0.25u) withcolor 0.75*white;
linecap := butt;
draw (0,0)--(tubelen,0);
linecap := rounded;

%DRAW CHUNK A

a0=point(0.3) of t;
a1=point(0.8) of t;
a2=point(0.3) of b;
a3=point(0.8) of b;
pa1=buildcycle(a0--a2,t,a1--a3,b);

pa2 = fullcircle rotated 180 xscaled (0.2*lwidth) yscaled lwidth shifted 1/2[a0,a2];
pa3 = halfcircle rotated -90 xscaled (0.2*lwidth) yscaled lwidth shifted 1/2[a1,a3];
pa4 = halfcircle rotated  90 xscaled (0.2*lwidth) yscaled lwidth shifted 1/2[a1,a3];

pa5 = buildcycle(pa2,t,pa3,b);

fill pa2 withcolor capcol;
fill pa5 withcolor chunkcol;
draw pa2;
draw pa3;
draw pa4 dashed evenly;

a9 = center(buildcycle(pa4,pa3));
pa6 = a9--(a9+(a9-center(pa2))/3);
draw      pa6 cutafter  pa3 withpen pencircle scaled 1;
drawarrow pa6 cutbefore pa3 withpen pencircle scaled 1;
label.rt (btex $v_1$ etex, point(1) of pa6);

pa7 = (a2-(0.2u,0.5u)){dir(90)}..2/5[a2,center(pa2)];
drawarrow pa7;
label.bot(btex $A_1$ etex, point(0) of pa7);

a4 = whatever[a0,a3]=whatever[a1,a2];
a5 = (xpart(a4),0);
a6 = a5+(0,1u);
drawdblarrow a5--a4;
draw (a4-(0.1u,0))--(a4+(0.1u,0));
alab1 = thelabel(btex $h_1$ etex, (0,0));
unfill bbox alab1 shifted a6;
draw        alab1 shifted a6;

a11 = center(pa2);
a10 = a11+(a11-a9)/8;
drawarrow a10--a11 withpen pencircle scaled 2;
label.lft(btex $p_1$ etex, 1/4[a10,a11]);

a7 = a0 + (0,0.35u);
a8 = a1 + (0,0.35u);
draw a0--(a7 + (0,0.175u)) withcolor 0.5*white;
draw a1--(a8 + (0,0.175u)) withcolor 0.5*white;
drawdblarrow a7--a8;
alab2 =thelabel(btex $v_1\Delta t=s_1$ etex, (0,0));
unfill bbox alab2 shifted 1/2[a7,a8];
draw alab2 shifted 1/2[a7,a8];

%DRAW CHUNK B

b0=point(2.2) of t;
b1=point(2.6) of t;
b2=point(2.2) of b;
b3=point(2.6) of b;
pb1=buildcycle(b0--b2,t,b1--b3,b);
fill pb1 withcolor 0.6[blue,white];

pb2 = fullcircle rotated 180 xscaled (0.2*rwidth) yscaled rwidth shifted 1/2[b0,b2];
pb3 = halfcircle rotated -90 xscaled (0.2*rwidth) yscaled rwidth shifted 1/2[b1,b3];
pb4 = halfcircle rotated  90 xscaled (0.2*rwidth) yscaled rwidth shifted 1/2[b1,b3];

pb5 = buildcycle(pb2,t,pb3,b);

fill pb2 withcolor capcol;
fill pb5 withcolor chunkcol;
draw pb2;
draw pb3;
draw pb4 dashed evenly;

b9 = center(buildcycle(pb4,pb3));
pb6 = b9--(b9+(b9-center(pb2))/3);
draw      pb6 cutafter  pb3 withpen pencircle scaled 1;
drawarrow pb6 cutbefore pb3 withpen pencircle scaled 1;
label.rt (btex $v_2$ etex, point(1) of pb6);

pb7 = (b2-(0.2u,0.5u)){dir(90)}..2/5[b2,center(pb2)];
drawarrow pb7;
label.bot(btex $A_2$ etex, point(0) of pb7);

b4 = whatever[b0,b3]=whatever[b1,b2];
b5 = (xpart(b4),0);
b6 = b5+(0,1u);
drawdblarrow b5--b4;
draw (b4-(0.1u,0))--(b4+(0.1u,0));
blab1 = thelabel(btex $h_2$ etex, (0,0));
unfill bbox blab1 shifted b6;
draw        blab1 shifted b6;

b11 = center(pb2);
b10 = b11+(b11-b9)/8;
drawarrow b10--b11 withpen pencircle scaled 2;
label.lft(btex $p_2$ etex, 1/4[b10,b11]);

b7 = b0 + (0,0.35u);
b8 = b1 + (0,0.35u);
draw b0--(b7 + (0,0.175u)) withcolor 0.6*white;
draw b1--(b8 + (0,0.175u)) withcolor 0.6*white;
drawdblarrow b7--b8;
blab2 =thelabel(btex $v_2\Delta t=s_2$ etex, (0,0));
unfill bbox blab2 shifted 1/2[b7,b8];
draw blab2 shifted 1/2[b7,b8];

%DRAW FLUID TUBE

linecap := butt;

draw t withpen pencircle scaled 1;
draw b withpen pencircle scaled 1;

path acap,bcap,bcapa,bcapb;
acap  = fullcircle rotated 180 xscaled (0.2*lwidth) yscaled lwidth shifted 1/2[z0,z2];
bcapa = halfcircle rotated -90 xscaled (0.2*rwidth) yscaled rwidth shifted 1/2[z1,z3];
bcapb = halfcircle rotated  90 xscaled (0.2*rwidth) yscaled rwidth shifted 1/2[z1,z3];

bcap = buildcycle(bcapa,bcapb);

fill acap withcolor backcol;
fill bcap withcolor backcol;

linecap := rounded;

draw acap  withpen pencircle scaled 1;
draw bcapa withpen pencircle scaled 1;
draw bcapb withpen pencircle scaled 1 dashed evenly;

%uncomment the following line to draw a density symbol in the center of the figure
%label (btex $\rho$ etex, 1/2[point 1.5 of t, point 1.5 of b]);

endfig;

मैं, इस कार्य का/की कॉपीराइट धारक, इसे निम्न लाइसेंसों के अंतर्गत प्रकाशित करता/करती हूँ:

इ दस्तावेज़ क Free Software Foundation द्वारा प्रकाशित जी॰एन॰यू फ़्री डॉक्यूमेंटेशन लाइसेंस केरौ संस्करण 1.2 या नया (बिना कोनो इन्वेरियेंट अनुभागऽ आरू अगला या पिछला आवरण केरौ पाठ के) के अंतर्गत कॉपी, वितरित आरू/या परिवर्तित करै के अनुमति प्रदान करलौ जाय छै. इ लाइसेंस के एगो प्रति जी॰एन॰यू फ़्री डॉक्यूमेंटेशन लाइसेंस नामक अनुभाग मँ शामिल छै।http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

	इ क्रिएटिव कॉमन्स Attribution-Share Alike 3.0 Unported फ़ाइल के तहत लाइसेंस प्राप्त छै.
	तोंय मुक्त छौ: साझा करौ – रचना क कॉपी, वितरित आरू संचारित करै लेली रीमिक्स करै लेली – काम अनुकूलित करै लेली निम्नलिखित स्थिति केरौ अंधीन: एट्रीब्यूसन – ई अनिवार्य छै कि आपनै यथोचित श्रेय दियै, लाइसेंस केरो कड़ी दियै, आरू जों कोय बदलाव होलो हुअय त ओकरा इंगित करौ। आपनै ऐसनो कोय भी उपयुक्त तरीके सँ करै सकै छियै लेकिन कोय भी तरह ओकरा सँ ई नै जाहिर होना चाहिय्यो कि लाइसेंसधारी द्वारा आपनै क अथवा आपनै के ई प्रयोग क अनुमोदित करलो जाय रहलो छै। शेअर एलाइक – जों तोंय ई रचना मँ कोय बदलाव करल्हो, काटछाँट करल्हो, या फेरू कु्च्छू जोड़ल्हो, त आपनै निष्कर्ष स्वरूप बनलो रचना क खाली यहै या एकरो समान कोनो लाइसेंस के अन्तर्गत वितरित करै सकै छियै ।
	This licensing tag was added to this file as part of the GFDL licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue

इस फ़ाइल को क्रिएटिव कॉमन्स श्रेय-समानसांझा 2.5 साधारण लाइसेंस के अंतर्गत लाइसेंस किया गया है।

तोंय मुक्त छौ:

• साझा करौ – रचना क कॉपी, वितरित आरू संचारित करै लेली
• रीमिक्स करै लेली – काम अनुकूलित करै लेली

निम्नलिखित स्थिति केरौ अंधीन:

• एट्रीब्यूसन – ई अनिवार्य छै कि आपनै यथोचित श्रेय दियै, लाइसेंस केरो कड़ी दियै, आरू जों कोय बदलाव होलो हुअय त ओकरा इंगित करौ। आपनै ऐसनो कोय भी उपयुक्त तरीके सँ करै सकै छियै लेकिन कोय भी तरह ओकरा सँ ई नै जाहिर होना चाहिय्यो कि लाइसेंसधारी द्वारा आपनै क अथवा आपनै के ई प्रयोग क अनुमोदित करलो जाय रहलो छै।
• शेअर एलाइक – जों तोंय ई रचना मँ कोय बदलाव करल्हो, काटछाँट करल्हो, या फेरू कु्च्छू जोड़ल्हो, त आपनै निष्कर्ष स्वरूप बनलो रचना क खाली यहै या एकरो समान कोनो लाइसेंस के अन्तर्गत वितरित करै सकै छियै ।

https://creativecommons.org/licenses/by-sa/2.5CC BY-SA 2.5 Creative Commons Attribution-Share Alike 2.5 truetrue

आपनै आपनौ पसंद के लाईसेंस चुनै सकै छियै.