The 1983 definition of the kilogram has changed. It will now be defined in terms of Planck's constant, and not the international prototype kept in Paris
The other day, I did something I am dispatched to do every now and then: bought a kilo of basmati rice. It came nicely packaged in a sealed bag. It feels about what I think a kilogram should feel like, and it’s actually labelled “1 kg", and that was enough for me. I didn’t ask that it be weighed. Even when a vendor actually weighs a kilo of something for me—apples or onions, say—I don’t think about it much. There’s a weight on one side of the balance that’s marked “1 kg", and that’s enough for me.