Hail is lumps of water ice and the largest hail stone recorded measured 20cm in diameter (a tennis ball has a diameter od around 6.5cm)! The main difference between snow and hail is shape. Snow is crystalline ice water in the form of a flake, while hail is a ball.
If you leave a car on the street and look at the car after it was snowed under, the car would be undamaged, once the snow is gone. If you look at the car after it was covered in hail, and the hail is gone, the surface will show small dents (or bigger dents depending on the size of the hail). So hail particles are bigger then snow flakes and can cause more damage.
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