FlaskFiller is an educational web application for 5th and 6th grade. Using FlaskFiller students are able to fill up virtual glasses, like a highball glass, a lemonade glass, a cocktail glass, and an Erlenmeyer flask. We can describe the filling of a glass with water using two quantities: the volume of the water in the glass and the height of the water level in the glass. And, of course, time is also changing during the whole filling process.
FlaskFiller enables students to explore the relationship between volume,
height, and time in this situation of change. To explore students have two
tools: creating a measuring cup of the glass and drawing a graph. The
measure lines are invisible when the microworld is started, you enable
them by clicking the 
-button. The measure lines
given can be dragged onto the glass. When running the simulation, students
can check if they have positioned the measure lines correctly. When the
lines are positioned incorrectly students are invited to think about the
situation some more.
The simulation of the filling of the glass is controlled by the start
button (
), the pause button (
) and the clear all (in Dutch
Leegmaken) button (
).
After studying the relation between volume and water level height,
students can express that relationship by drawing a graph. Click the
graph button (
) to enable graphing.
In this empty graph a student can:
);
);
);
).
The students can check their graphs by running the simulation of
filling the glass again after enabling the automatic graph tool by
clicking the 
-button. Again, seeing their own
work and the correct graph drawn by the microworld, students are
invited to think about the differences and what those differences mean
in terms of change.
For some of the pupils it might feel strange to not study change in
relation to time. Besides the relationship between volume and height,
the relationship between time and height can also be taken into
account. To change to time, click the time-button (
). A timer will appear and the student
can draw time verus height graphs.
FlaskFiller can be easily reset by refreshing the webpage (shortcut F5).
FlaskFiller is designed for Dutch primary education and the interface is in Dutch. On the other hand, text is only sparsely used in FlaskFiller.
For questions and remarks, please send an email to the designer and programmer of FlaskFiller: Huub de Beer.