A hospital prepares a liquid medicine. The weight ratio of medicine to water is 1:1000. The existing medicine is 2.5 kg. How many kilograms of this liquid medicine can be prepared?
某医院配制一种药水，药与水的重量比是1：1000，现有药2.5千克，可以配制这种药水多少千克？
<gadget id="calculator">1 / 1_000</gadget>
<output>1/1_000 = around 0.001</output>

<gadget id="calculator">2.5 / (1/1_000)</gadget>
<output>2_500</output>

<gadget id="calculator">2.5 + 2_500</gadget>
<output>2_502.5</output>

<result>2_502.5</result>