Metal Lids on Glass Jars Can Often Be Loosened by Running

question 76

Multiple Choice

Metal lids on glass jars can often be loosened by running them under hot water.Why is this?

• A)The hot water is a lubricant.
• B)The metal and glass expand due to the heating,and the glass being of smaller radius expands less than the metal.
• C)The metal has a higher coefficient of thermal expansion than glass so the metal expands more than the glass thus loosening the connection.
• D)This is just folklore.

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Definitions:

Placebo Effect

Experimental results caused by expectations alone; any effect on behavior caused by the administration of an inert substance or condition, which the recipient assumes is an active agent.

Overconfidence

The tendency to be more confident than correct—to overestimate the accuracy of our beliefs and judgments.

Illusory Correlation

The perception of a relationship where none exists.

Space Study Time

The planned and structured periods dedicated to the study and exploration of outer space.