On Monday, March 26, 2018 at 5:48:50 AM UTC-7, AS wrote:
To be correct (and some may call it being anal): the one liter of water cause a force of 9.81N. It does not ‘weigh’ 9.81N!
Uli
‘AS’

Generally, weight is defined as the force resulting on a mass in a gravitational field. Kilograms are a measure of mass, not force (unless you specify the ******* unit "kilograms force", like "pounds mass"). The measure of force in the SI system is Newtons. On the surface of the earth, one kilogram mass causes a force of 9.8 Newtons, properly called it's "weight". So to be correct AND anal, one liter of water has a mass of one kilogram, and weighs 9.81 Newtons (on earth). In space a liter of water still has a mass of one kilogram, but a weight of (nearly) zero Newtons.

Yes, I was typing ahead of my brain, a nautical mile is one minute of latitude. It is marginally useful on aeronautical charts, where dividers can be used to scale miles off of the latitude marks. In celestial navigation on boats (and they used to do that in planes!) it is quite a useful unit, as distances are first calculated in spherical arcs.