1.- Mercury thermometers cannot measure temperatures below -30ºC because at that temperature the Hg becomes pasty. Could you indicate what temperature Fahrenheit and Kelvin correspond to?

heat the gas and measure the pressure

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete

i believe the answer would be:

d. violin, clarinet, french horn, and tuba

an electric circuit