For example, a balburst is the amount of force needed to pop a one-breath balloon.
"Proposals that consciously ignore or downplay the amount and type of force needed to protect civilians are just wishful thinking".
The amount of force needed shows how well stuck the tube was, and thus how repellent of the hydrate the chemical on the steel is.
Deep Space 1's ion motor, by contrast, produces only the amount of force needed to keep a piece of paper in the air by blowing on it.
"A small kid would not have enough strength to create the level of force needed to make the gun shoot a long way," he recalled.
The strength of concrete is measured in pounds per square inch or kilograms per square centimetre of force needed to crush a sample of a given age or hardness.
The amount of force needed shows how well stuck the tube was, and thus how well each chemical mixture on the steel repells the hydrate.Dr Varanasi and his colleagues tried ten promising chemical cocktails.
This and other experimental results, the researchers say, indicate that the collagen has bonds that break below the level of force needed to harm the bone's overall structure.
Obviously if someone is under attack from someone he genuinely believes is violent and armed – then that person cannot be expected to weigh up precisely the amount of force needed to prevent that attack.
