Produce is brought to a roof to prevent worm-infestation and dew descends on it. Is the produce susceptible to impurity?
Halacha 1 states that if the person brought produce to the roof to prevent worm-infestation and dew descended, it does NOT become susceptible to impurity — specific intent for the dew is required.
Question 2
Bundles of vegetables are placed on a roof to be preserved and dew falls. Do they become susceptible?
Halacha 2 explicitly states that we do NOT say that since everyone knows dew will descend, the person is deemed to have intended it. The vegetables do not become susceptible.
Question 3
A hot barley loaf is placed on the opening of a jug of wine. What happens?
Halacha 6 states that if the loaf was from barley flour, it does become susceptible to impurity (because barley flour absorbs moisture). Wheat flour, by contrast, does not become susceptible.
Question 4
When a person blows on lentils to check their quality and water collects on them from the breath, what is the status of the lentils?
Halacha 14 states that if water collects on them from the moisture in his breath, they become susceptible to impurity — because breath moisture is a derivative of water.
Question 5
A person sprinkles water on the floor and places wheat on it. The wheat becomes moist from the stone surface. Is it susceptible to impurity?
Halacha 7 states that if the wheat became moist because of the stone (not the water), it does NOT become susceptible to impurity. Only if it became moist from the sprinkled water is it susceptible.