It just depends on the way your bath/sinks are plumbed vs the amount of vent air available. If you system is designed with adequate air venting the "gurgle" will be reduced or eliminated.
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An average bathroom sink is 6-7 litres
Additional shut off valve, below sink or in basement. Incomplete pipes not tied into bathroom sink line.
Snake your drains
vanitey
A bathroom would have a toilet-sink-tub and or shower. A half bath has a toilet maybe a sink but no tub or shower.
a bathroom
This indicates that it has a toilet, sink and a shower but no bathtub. A 1.50 indicates that it has a toilet, sink but no shower or bathtub.
no
it is a sink, toilet and a shower (if it has a bathtub it would be a 4 piece bathroom)
rest room: toilet and a sink bathroom: toilet, sink and a shower or a bathing tub sometimes both
A 3/4 bathroom means that it has a shower, but not a bathtub. 1/2 bath - Toilet (and maybe a hand sink) 3/4 bath - Toilet, hand sink, shower Full bath - Toilet, Sink and bathtub
it has a toilet, sink, shower and tub. (if it has a shower stall and no tub it is called a 3 piece)
Bath, toilet, sink, shower, mirror, toothbrush, shaver ?
that means you might have a leak in the pipes or something.
Generally called a half bath. Sink and toilet, no tub or shower.
A bathroom has 3 things in it. A toilet, sink and tub or shower. I would assume the .3 would be one with just a toilet and no sink. If it had a sink, it would be 1 1/2 bath.