Kilograms for a row boat but a ton for larger vessels.
Gram.
The metric (SI) unit for weight is the newton, since weight is a force. When people talk about "weight", they sometimes actually mean "mass". The unit for mass is the kilogram.
Gram.
a ruler
Tonnes
grams
Meters
The metric standard unit of mass is the kilogram (Kg).
The SI (metric) unit for mass is the kilogram.
Milligrams.
The SI unit for mass in the metric system is the kilogram.
A neutron is an electrically neutral subatomic particle. A Newton is the metric unit of force. A Kilogram is the metric unit of mass. We have no idea what a 'newtron' is.
The SI unit of mass is the Kilogram.
Grams
The metric standard unit of mass is the kilogram (Kg).
The mass of a beetle in metric units is 5 metric units no joke!
In physics, mass is usually measured in kilograms. Metric weighing-scales will usually display mass in kilograms, so this is a likely choice for the measurement of a person's mass.