Your hot water pipes have rust in them.
When hot water and cold water are mixed together, heat flows from hot water to cold water and brings them to equilibrium at a temperature intermediate to that of hot water and the cold water That may be right, but I think that the hot water would be more dominant causing the cold water to almost instantly turn hot.
hot
Hot and cold water and a freezer and a timer or stopwatch
When you add hot water to cold water, the cold water warms up because of thermal conduction. Some of the kinetic energy of the hot water transfers to the cold water on contact, eventually leading to a uniform temperature throughout.
Nitrogen is cold.
Bad shower valve.
Supply lines- Hot and cold water for each sink, bathtub, Jacuzzi tub, and shower. Cold water for each toilet. Drain lines- one for each sink, bathtub, Jacuzzi tub, shower, and toilet.
You can get the shine back on an old porcelain bathtub by washing it with an all-purpose bathtub cleaner and then rinsing it clean with water. Next, pour several cups of vinegar into a bathtub of hot water and allow it to sit for a few hours. Rinse the tub with cold water then take a dry, soft cloth to buff the bathtub.
Call Bob the Builder.
If it had been working fine -- then if it is a cartriage type -- replace it --
Yes and a vent and hot and cold water to it and a waste line would also be a great idea
it depends on what your hot water level is
Water can be hot or cold if you want
Turn on your bathtub or shower hot then turn it off at last turn on your hot water for your sink. Hope this helps!
Some hot/cold mixer have separate metering valves on each hot and cold water supply, perhaps the cold water supply metering valve is fully closed. Look for a slotted screw adjustment on the metering valve, using a screwdriver to open or close the valve as required.
HOT rises COLD sinks
Hot water is less denser than cold water and has a greater temperature.