At the science fair, Malia uses 8 fluid ounces of vinegar to make her volcano erupt. How many times can she make her volcano erupt with 1 quart of vinegar?

There are 32 fluid ounces in 1 quart.

Thus, Malia can make her volcano erupt 32/8 = <<32/8=4>>4 times with 1 quart of vinegar. Answer: \boxed{4}.