Ellyse Perry (L) bowls past Omaima Sohail during the Round 1 Women's Cricket World Cup match at Bay Oval in Tauranga on Tuesday. AFP
In-form opening batter Alyssa Healy led the way for the six-time champions with 72 off 79 balls, supported by 35 from skipper Meg Lanning and 34 from Rachel Haynes.
Pakistan captain Bismah Maroof scored 78 as her team made 190-6 after losing the toss and being put into bat.
Despite a much-improved performance on their first-round loss to India, Pakistan paid the price for a sluggish run rate.
Allrounder Aliya Riaz made a creditable 53 but it came off 109 balls, while Australia's top order scored at almost a run a ball.
The result puts Australia top of the tournament's eight-team leaderboard but leaves Pakistan bottom with a struggle to make the final four after two losses.
"Everyone's in really good form, we all got starts and I guess we're all feeling in good nick," Lanning said.
"Pakistan did extremely well and made it hard for us to take wickets so we were disciplined and kept that run rate in check."
Pakistan's total never looked enough against Australia's formidable big hitters, who overhauled the target with 15.2 overs to spare, finishing on 193-3.
Maroof said Pakistan were unable to exert pressure in the field. "We could have stopped them, they gave us chances but we didn't capitalise," she said.
"In fielding we could have done much better."
Defeat left Pakistan without a win against Australia in 13 ODI matches. Pakistan face South Africa on Friday while Australia's next challenge is against hosts New Zealand on Sunday.
A half century by Nida Dar carried Pakistan close to a victory which would have been one of the most significant in its World Cup history. But she was run out for 55 in the 49th over.
The International Cricket Council had earlier announced that India will remain the hosts of the 2021 tournament while the postponed 2020 tournament which was to be held in Australia will now take place in 2023. Identifying backup venues is standard practice for any tournament.
The 2020 edition of the T20 World Cup — postponed by the coronavirus pandemic — will be staged in Australia in 2022, the International Cricket Council announced on Friday.
Amy Satterthwaite scored 75 and Amelia Kerr added 50 as New Zealand made 260-9, batting first after India won the toss. Harmanpreet Kaur made an outstanding 71 from 63 balls to lead her team’s response but India was all out for 198 in the 47th over.
UAE Equestrian and Racing Federation announced that its four-strong dressage team has passed the vet check and will go on to compete on Tuesday, in the team competition and individual qualification.
Lock Thibaud Flament studied at Loughborough University in England, full-back Melvyn Jaminet had never played a Top 14 game and winger Gabin Villiere was a second-team scrum-half in the French fifth-tier before bursting onto the international scene.
Batting first India reached 116-7 in their 20 overs with Smriti Mandhana (46) and Jemimah Rodrigues (42) putting on 73 for the second wicket. Sri Lanka's chase started badly when they were reduced to 14-3 in the fifth over by a devastating spell from right-arm seamer Titas Sadhu.