Question

You want a potof water to boil at 105 celcius. How heavy a

lid should youput on the 15 cm diameter pot when Patm =
101kPa?

Answer 1

35.7 kg lid we put

Step-by-step explanation:

given data

temperature = 105 celcius

diameter = 15 cm

Patm = 101 kPa

to find out

How heavy a lid should you put

solution

we know Psaturated from table for temperature is 105 celcius is

Psat = 120.8 kPa

so

area will be here

area =
`(\pi )/(4) d^2` ..................1

here d is diameter

put the value in equation 1

area =
`(\pi )/(4) 0.15^2`

area = 0.01767 m²

so net force is

Fnet = ( Psat - Patm ) × area

Fnet = ( 120.8 - 101 ) × 0.01767

Fnet = 0.3498 KN = 350 N

we know

Fnet = mg

mass =
`(Fnet)/(g)`

mass =
`(350)/(9.8)`

mass = 35.7 kg

so 35.7 kg lid we put