From 720efe00dc3041c6c91d18723c5463e6f476643a Mon Sep 17 00:00:00 2001 From: Freek Pols Date: Fri, 10 Jan 2025 09:50:33 +0100 Subject: [PATCH] incl alt txt --- book/demos/demo01/demo01.md | 3 +++ book/demos/demo02/demo02.md | 2 ++ book/demos/demo03/demo03.md | 3 +++ book/demos/demo04/demo04.md | 6 ++++++ book/demos/demo05/demo05.md | 2 ++ book/demos/demo06/demo06.md | 4 ++++ book/demos/demo07/demo07.md | 2 ++ book/demos/demo08/demo08.md | 2 ++ book/demos/demo09/demo09.md | 2 ++ book/demos/demo10/demo10.md | 3 +++ book/demos/demo11/demo11.md | 1 + 11 files changed, 30 insertions(+) diff --git a/book/demos/demo01/demo01.md b/book/demos/demo01/demo01.md index e8ae489..2bd8f03 100644 --- a/book/demos/demo01/demo01.md +++ b/book/demos/demo01/demo01.md @@ -64,6 +64,7 @@ Cut one of the eggs in a bowl, fill the syringe with its contents, remove the ai --- width: 50% align: center +alt: an unboiled egg in shell in jar with vinegar --- An unboiled egg in vinegar. ``` @@ -82,6 +83,7 @@ Together, decide which other substances you want to test (include some food colo --- width: 50% align: center +alt: unboiled egg without its shell in hands of experimenter --- Unboiled egg without its shell. ``` @@ -112,6 +114,7 @@ What causes some substances to pass through both membranes, others to pass throu --- width: 50% align: center +alt: open egg, egg white is colored, inner part is still yellow. --- Food coloring penetrates the outer but not the inner membrane. ``` diff --git a/book/demos/demo02/demo02.md b/book/demos/demo02/demo02.md index c1dc87d..57a921f 100644 --- a/book/demos/demo02/demo02.md +++ b/book/demos/demo02/demo02.md @@ -29,6 +29,7 @@ A cup of cappuccino is prepared by adding about 50 mL frothing, foaming milk to --- width: 50% align: center +alt: a cappuccino where the milk foam is clearly visible. --- The context of this demonstration: A cappuccino ``` @@ -76,6 +77,7 @@ Steam can cause bad burns. So watch out with the steam coming through the rubber --- width: 50% align: center +alt: a bunsenburner heating the water in a flask, a connected tube to heat the milk. --- The experimental setup ``` diff --git a/book/demos/demo03/demo03.md b/book/demos/demo03/demo03.md index fd5dcf5..687014c 100644 --- a/book/demos/demo03/demo03.md +++ b/book/demos/demo03/demo03.md @@ -49,6 +49,7 @@ Light the candle and put it under the vacuum bell jar so that smoke is trapped b width: 50% align: center name: demo3_fig1 +alt: left laser, center a vacuum bell jar. --- The setup consisting of a laser, a vacuum bell jar and a small candle for smoke. ``` @@ -62,6 +63,7 @@ Turn the laser on and ask students what they observe. *Is the laser beam visible --- width: 50% align: center +alt: a red laser beam is visible inside the jar --- The laser beam is well visible, but the entire bell jar is illuminated as well! ``` @@ -71,6 +73,7 @@ Ask students to write down their observation when you turn on the vacuum pump. I --- width: 50% align: center +alt: only two laser spots, at the corner of the jar, are visible --- When the bell jar gets more and more vacuum, the light intensity of the laser beam is less until it is not visible at all anymore. ``` diff --git a/book/demos/demo04/demo04.md b/book/demos/demo04/demo04.md index 1577085..45ecf3f 100644 --- a/book/demos/demo04/demo04.md +++ b/book/demos/demo04/demo04.md @@ -23,6 +23,7 @@ --- width: 50% align: center +alt: stacked blocks --- A challenge: Building a slanting tower where the top block is not above the bottom block. ``` @@ -39,6 +40,7 @@ If you put two blocks on top of each other, then the upper one remains stable if width: 50% align: center name: demo04_fig1 +alt: stacked blocks, evenly spaced. --- The demo requires only some blocks. ``` @@ -52,6 +54,7 @@ Is it possible that the back of the top block passes the front of the bottom blo width: 50% align: center name: demo04_fig2 +alt: schematic of stacked blocks illustrating how top one is left of the lowest one --- We can try to use the approach that first comes into mind... but probably won't succeed. ``` @@ -67,6 +70,7 @@ It is also possible to arrange the pile in reversed order: from top to bottom ({ width: 50% align: center name: demo04_fig5 +alt: finger used to balance two block --- Building the pile in reversed order requires to find the center of mass each time. ``` @@ -83,6 +87,7 @@ All of that above block 5 and the overhang is already more than one block length width: 50% align: center name: demo04_fig3 +alt: schematic of correct way of stacking blocks --- The physics (and mathematics) behind stacking blocks ``` @@ -96,6 +101,7 @@ The physics (and mathematics) behind stacking blocks width: 50% align: center name: demo04_fig4 +alt: picture of the market hall in rotterdam, illustrating the practical use of stacked blocks --- The market hall in Rotterdam is stacked according to the principle above. Figure obtained from: https://commons.wikimedia.org/wiki/File:Markthal-Rotterdam.jpg (CC BY-SA) ``` diff --git a/book/demos/demo05/demo05.md b/book/demos/demo05/demo05.md index d9ade8a..f1128fe 100644 --- a/book/demos/demo05/demo05.md +++ b/book/demos/demo05/demo05.md @@ -28,6 +28,7 @@ In their own practical work students may easily overlook the details in the phen width: 90% align: center name: demo05_fig1 +alt: setup, left a weight with string attached through wheels connected to spring-balance to cart to spring balance --- A schematic of the experimental setup ``` @@ -56,6 +57,7 @@ A [Predict-Observe-Explain](../../Pedagogy/PoE.md) approach is appropriate here. --- width: 70% align: center +alt: the experimental setup as used in class --- The actual setup ``` diff --git a/book/demos/demo06/demo06.md b/book/demos/demo06/demo06.md index 94f7d88..461e94d 100644 --- a/book/demos/demo06/demo06.md +++ b/book/demos/demo06/demo06.md @@ -24,6 +24,7 @@ width: 70% align: center name: demo06_fig1 +alt: illuminated aquarium and a rainbow at the wall --- An aquarium filled with water is put on an overheadprojector ``` @@ -47,6 +48,7 @@ Cover the OHP with white sheets of paper. Put the container with water (about ¾ width: 50% align: center name: demo06_fig3 +alt: aquarium and two rainbows --- The aquarium is slightly rotated resulting in two spectacular spectra. ``` @@ -56,6 +58,7 @@ The aquarium is slightly rotated resulting in two spectacular spectra. width: 50% align: center name: demo06_fig4 +alt: light rays --- The light rays move from A, B and C to A', B' and C'. ``` @@ -64,6 +67,7 @@ The light rays move from A, B and C to A', B' and C'. --- width: 50% align: center +alt: the setup, an aquarium on top of an overheadprojector --- The setup. The rainbows appear on the left and right walls. ``` diff --git a/book/demos/demo07/demo07.md b/book/demos/demo07/demo07.md index 06d55ef..496817b 100644 --- a/book/demos/demo07/demo07.md +++ b/book/demos/demo07/demo07.md @@ -27,6 +27,7 @@ Five or six pendulums are suspended from a rod ({numref}`Figure {number}