what is going to happen to a balloon filled with helium that is left in a car over night when the temperature drops approximately 20 degrees? (there are no holes in the balloon

The balloon is going to be somewhat deflated due to the decrease in volume. Since volume is directly proportional to temperature.

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The size of the balloon will change as it size will get reduce with decease in temperature.

Explanation:

Charles law states that 'At constant pressure , volume occupied by the gas is directly proportional to the temperature of the gas.

(Constant pressure)

So , when the balloon is left in the car over night where temperature drops to 20 degree Celsius that 293.15 Kelvins the size of the balloon got decreased. This is due to decrease in temperature of the gas with which the volume occupied by the gas also get decrease.

the cold front replaces the warmer air at the ground level changing the wind to be breezy and denser.there is also an immediate drop in the temperature.