millimetres (centimetres could also be used)
Matter isn't really something you can measure. To measure mass, you would use a balance.
A scientist would most likely use a ruler or caliper to measure the length of a nail or other small object. These tools provide accurate measurements in centimeters or inches.
None of them. I would use litres. However, if you wish to use non-standard, obsolete units you could use "gallon".
You can use trigonometry to measure the height of an object that is too far away to directly measure the distance to. By measuring the angle of elevation from your position to the top of the object and knowing your distance from the object, you can use trigonometric functions to calculate the height.
You would use Volume.
millimetres (centimetres could also be used)
When the object is larger than the ruler.
A scale.
a ruler
Liters.
in math
The density of a substance is the ratio of its mass to its volume. So, I would measure the mass and volume of a substance to calculate density.
g/cm3
You would use a ruler or measuring tape to measure the length of an object. Place the edge of the ruler or tape at one end of the object and note the measurement where the object ends. Make sure to read the measurement carefully to get an accurate length.
I would place it in a container full of liquid after measuring the liquid. I would measure the amount of liquid displaced by the object. That amount is equal to the volume of the irregular object if it is fully submerged in the liquid.
the answer is quarts