Sounds like engine coolant and what type of coolant depends on the vehicle.
yes, they can be reused as tuperware, but i would suggest handwashing them instead of putting them in the dishwasher.
Ullage is the empty space in a container. This usually refers to a gas or oil storage container. An ullage report states the difference between the height of the cargo and the roof of the container.
Fill the 5 litre container and empty it into the 9 litre one. Fill the 5 litre (again) and empty 4 litres into the 9 litre container. Now - empty the remaining litre into the 6 litre container. Finally re-fill the 5 litre container and empty into the 6 litre one - and you're done.
In general any pressurized gas container is "empty" when the pressure inside is equal to ambient air pressure. There is still gas in the container, but not enough pressure to expell the gas. Medical oxygen tanks should never be allowed to go below 200psi. The tank is considered empty at this point and should be replaced.
Empty and wet, yes. Empty and dry, no.
No
An empty gas container actually weighs less than a full container.
Where you can refill and empty container depends on what you want to refill it with. It can be refilled with water from a tap, or with lotion from a refill bag bought from the store.
The empty glass is broken first.
The absolute empty weight of an aircraft, cargo container etc.
It has air inside and other substances which we cannot see with our naked eye. Air is matter so unless the container is a vacuum it will not be empty.
The container volume is missing.