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This is Scientific American's 60-second science. I'm Christopher in Taliatta.

You ever order a drink and feel stiff on the poor?

Well, before you bother your bartender, take a closer look at the size of your glass.

So people will generally perceive there to be less in larger containers than smaller ones.

Teresa Marteau, a behavioral scientist at the University of Cambridge in England.

She and her colleagues had analyzed how larger portions and larger plates lure us into eating more

food, and they wondered, could the same be true for alcohol?

So the researchers convinced the staff at a local bar to run an experiment.

Every two weeks, for four months, they'd rotate the bar's wine glasses, from the standard

300-millimeter size to either slightly larger, 370 milliliters, or slightly smaller, 250-millimeter.

And see how the size of the glass affected patrons' drinking habits,

even though the poor, the volume of alcoholic beverage, was unchanged.

Turns out, serving wine in smaller glasses had no measurable effect.

But the large glasses, they boosted wine sales 10%,

even after controlling for day of the week,

temperature, holidays, and so on. The reason, she says, when the wine, the same volume is being

served in the larger glass, that people are probably perceiving that they've got less in there.

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