Vacuum A completely empty space. The collapsing can experiment shows the effect of the pressure of gas particles. The gas particles on the inside of the can are removed, leaving a vacuum. The pressure of the particles on the outside squash the can.
A common mistake is to think that the vacuum sucks the can inwards.
Variable A factor that can be changed in an experiment. There are different ways to describe variables and these are important for "How Science Works".
Discrete variable: Only whole numbers are possible (such as how many layers of insulation).
The values are steps.
Continuous variable: Any number is possible (such as the thickness of insulation).
The values are gradual.
Categoric variable: A description is used to identify the variable (such as cork insulation or polystyrene)
Independent variable: The variable that is adjusted to change the conditions of the experiment so that we can find out the value of the dependent variable.
Dependent variable: The one we find out about. Its value depends on the value of the variable that we adjust.
Fixed variable: A factor that could have been changed but we decided to hold constant in order to make the experiment a fair test.
Vibration Solids are made of particles that are vibrating. The particles are fixed in position but can wriggle about.
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