в количестве

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The uranium, thorium, and potassium together supply heat at a rate of 3*10^-9 W/ton.

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The events take place at a rate of only a few per day.

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Benzaldehyde is produced at the rate of about 2,000,000 lb annually.

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Barium is found to the extent of 0.04% in the earth's crust.

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Lactose is present in milk to the extent of about 4 percent.

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Iron may be added for particular purposes in amounts of 1% or more.

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В количестве -- in an amount; to the extent of; at the rate of (с расходом)

 Each bearing receives a continuous supply of fresh oil in an amount deemed suitable for operation.

 A 50 percent NOx reduction has been obtained by using water injection at the rate of 35 percent of the fuel flow.