<p>In Child Development battery(30years ago): testing of the concept of conservation was used diagnostically to indicate if a child had appropriate experiences that moved them from only concrete thinking to some abstract thinking.
In science teaching method: activities are introduced to help develop the concept of conservation of volume as it is essential for successful manual experimentation or "wet lab" techniques and this is the basis for further development of concepts to conservation of mass and energy.</p>

<p>Some students miss out on these fundamental learning experiences in conservation which then can hamper the ability to build on them by the student and the teacher.</p>

CC BY-SA 3.0
2013-07-15T01:27:53.143Z
2013-07-15T01:27:53.143Z
Analogue girl
<p>This effect is referred to as <a href="http://www.sciencebuddies.org/science-fair-projects/project_ideas/HumBeh_p049.shtml">Piaget's Theory of Conservation</a>. </p>

<p>Piaget constructed an experiement where children would be shown a tall, narrow glass of colored water (to make it clearly visible in a clear glass) and two shorter, wider glasses of the same exact size. </p>

<p>A single amount of water would be distributed in both small glasses. If a child is asked "which has more" they're likely to reply they have the same amout of water, as they look identical. However after pouring the water from one short glass into a tall glass, if you ask the child again they are likely to say the tall glass has more water because it <em>looks</em> bigger.</p>

<p>The interesting thing is not that the child assumes the taller glass holds more liquid but that they fail to understand <strong>conservation</strong>: the fact that the water from one glass is going to be the same amount after being poured into any other container. It's as if they did not realize the water came from the same glass.</p>

<p>Here is a video recreating <a href="http://www.youtube.com/watch?v=d_trtZ5Xkp4">Piaget's Conservation Experiment</a>. It's common for developmental psychology courses to explain or show this experiment.</p>

CC BY-SA 3.0
2012-01-20T16:40:10.967Z
2012-01-20T20:07:35.827Z
2012-01-20T20:07:35.827Z
Zelda
<p>From Developmental psychology 101 I remember an experiment where the person conducting the experiment would pour liquid from a tall, narrow container into a short, narrow container and ask a child if the volume of the liquid had changed... or something similar to that. I can't remember if it actually involved pouring the liquid or just showing two containers. I remember it was used to determine if the child had reached some critical threshold and learned a specific skill, but my memory is very hazy on the details.</p>

<ul>
<li>Who invented this experiment?</li>
<li>How did it work? is my description accurate?</li>
<li>What is the name of the skill it's testing for?</li>
</ul>

CC BY-SA 3.0
2012-06-15T03:15:45.393Z
[A must see video of this in action](http://www.youtube.com/watch?v=YtLEWVu815o)
Artem Kaznatcheev
CC BY-SA 3.0
2012-06-15T11:45:19.700Z
That's a great example @ArtemKaznatcheev, thanks! I never get tired of watching these, they fascinate me. Like how the girl *counts* the quarters when they're together but is so sure there's more when they're spread out.
Josh
CC BY-SA 3.0
2012-06-15T11:52:17.737Z
Actually I like [this related video](http://www.youtube.com/watch?feature=endscreen&NR=1&v=5D-ySO0p4zo) even better. The kid is *so sure he's right*, even when the woman conducting the experiment presses him to explain himself. It shows that he can't just figure it out on his own...
Josh
<terminology><developmental-psychology><experimental-psychology>
What was the experiment where you pour liquid from a tall container to a short one and ask a child which has more?
Josh
# What was the experiment where you pour liquid from a tall container to a short one and ask a child which has more?

(Asked by: username_0 on 2012-01-20)

From Developmental psychology 101 I remember an experiment where the person conducting the experiment would pour liquid from a tall, narrow container into a short, narrow container and ask a child if the volume of the liquid had changed... or something similar to that. I can't remember if it actually involved pouring the liquid or just showing two containers. I remember it was used to determine if the child had reached some critical threshold and learned a specific skill, but my memory is very hazy on the details.

* Who invented this experiment?
* How did it work? is my description accurate?
* What is the name of the skill it's testing for?

**Tags:** terminology, developmental-psychology, experimental-psychology

> **Comments:**
> **username_1**: [A must see video of this in action](http://www.youtube.com/watch?v=YtLEWVu815o)  
> **username_0**: That's a great example @ArtemKaznatcheev, thanks! I never get tired of watching these, they fascinate me. Like how the girl *counts* the quarters when they're together but is so sure there's more when they're spread out.  
> **username_0**: Actually I like [this related video](http://www.youtube.com/watch?feature=endscreen&NR=1&v=5D-ySO0p4zo) even better. The kid is *so sure he's right*, even when the woman conducting the experiment presses him to explain himself. It shows that he can't just figure it out on his own...  

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## 2 answers

### Answer by username_3 on 2012-01-20. Score: 18 | Accepted answer

This effect is referred to as [Piaget's Theory of Conservation](http://www.sciencebuddies.org/science-fair-projects/project_ideas/HumBeh_p049.shtml).

Piaget constructed an experiement where children would be shown a tall, narrow glass of colored water (to make it clearly visible in a clear glass) and two shorter, wider glasses of the same exact size.

A single amount of water would be distributed in both small glasses. If a child is asked "which has more" they're likely to reply they have the same amout of water, as they look identical. However after pouring the water from one short glass into a tall glass, if you ask the child again they are likely to say the tall glass has more water because it *looks* bigger.

The interesting thing is not that the child assumes the taller glass holds more liquid but that they fail to understand **conservation**: the fact that the water from one glass is going to be the same amount after being poured into any other container. It's as if they did not realize the water came from the same glass.

Here is a video recreating [Piaget's Conservation Experiment](http://www.youtube.com/watch?v=d_trtZ5Xkp4). It's common for developmental psychology courses to explain or show this experiment.


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### Answer by username_2 on 2013-07-15. Score: 2

In Child Development battery(30years ago): testing of the concept of conservation was used diagnostically to indicate if a child had appropriate experiences that moved them from only concrete thinking to some abstract thinking.
In science teaching method: activities are introduced to help develop the concept of conservation of volume as it is essential for successful manual experimentation or "wet lab" techniques and this is the basis for further development of concepts to conservation of mass and energy.

Some students miss out on these fundamental learning experiences in conservation which then can hamper the ability to build on them by the student and the teacher.


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