1kg of liquid detergent = ??? litres of liquid detergent :)

Title tu is topic argument of me n fiance hari sabtu lepas. Punya la dh tkdak bnda lain dh nk argue. Kehkehkeh... Semua sbb p beli dynamo kt cold storage. My fiance claimed that 1l = 1kg, i disagreed right away sbb detergent is not purely water (H2O). Dia kn dh campur zarah2 lain. Cewah scientific argument lah kali ni. My fiance answer is right if we're weighing 1kg of water. (still tak tepat sbb actually 1litre=0.997kg.hehehe) Hehe.. Last2 x dpt jwpn coz it varies based on the liquid density. kena p timbang sendiri 1 litre brp kg. :D so who won this argument? Partially me for not having the answer and denying the fact that 1kg of liquid detergent equal to 1 litre .Hahaha