解题思路:
①封闭气体的压强为
P
=
P
0
+
ρ
g
h
解得
P
=
(
P
0
+
h
)
c
mH
g
②此时封闭气柱长
L
1
=
L
0
—
(
h
+
Δ
L
—
L
0
)
=
18
cm
由波意尔定律
(
P
0
+
h
)
L
0
=
(
P
0
+
L
1
)
L
1
解得
P
0
=
"
75
"
c
mH
g
① P=(P 0+h)cmHg ② P 0="75" cmHg
解题思路:
①封闭气体的压强为
P
=
P
0
+
ρ
g
h
解得
P
=
(
P
0
+
h
)
c
mH
g
②此时封闭气柱长
L
1
=
L
0
—
(
h
+
Δ
L
—
L
0
)
=
18
cm
由波意尔定律
(
P
0
+
h
)
L
0
=
(
P
0
+
L
1
)
L
1
解得
P
0
=
"
75
"
c
mH
g
① P=(P 0+h)cmHg ② P 0="75" cmHg