millimetres (centimetres could also be used)
Meters.
Metres (American spelling = meters), unit symbol "m", would be the most appropriate metric unit to measure the height of a 32-story building.
Although there is no official "Metric Gallon" there are those in the UK and the US who propose a metrication using the US and Imperial terminology. This means that a metric Pint is equal to 500 ml, a metric quart 1 litre and a metric gallon 4 litres etc. This would mean that full metric systems would be used and the traditional terminology would be kept for cultural reasons.
Please specify what you want to measure about the bucket, for example its height, width, circumference, volume, color, albedo, etc.
Centimeters would do it. A doorknob should be 91 centimeters (3 feet) above the floor.
You would use meters.
meters
Meters.
A door is about 2 meters, but most likely you'd measure in centimeters.
1 US gallon = 3.78541178 liters. Only if you mean pure water, then 1000 litres of water weighs 1 metric tonne. 1000 litres of water are 264.172052357 gallons that weigh 1 metric tonne.
Metres (American spelling = meters), unit symbol "m", would be the most appropriate metric unit to measure the height of a 32-story building.
If you mean measure height then it would be the metre if you mean measure weight it would be Kilograms
The height of a building is measured in metres.
While the dog is standing up on all fours, measure from the floor to the top of the shoulder.
Metre to measure its length. Possibly centimetres to measure its height if a garden fence but metres if a security fence.
I would use Meters
Although there is no official "Metric Gallon" there are those in the UK and the US who propose a metrication using the US and Imperial terminology. This means that a metric Pint is equal to 500 ml, a metric quart 1 litre and a metric gallon 4 litres etc. This would mean that full metric systems would be used and the traditional terminology would be kept for cultural reasons.